// Some additional DHTML functions

function fetch_offset(obj) {
  var left_offset = obj.offsetLeft;
  var top_offset = obj.offsetTop;
  while ((obj = obj.offsetParent) != null) {
    left_offset += obj.offsetLeft;
    top_offset += obj.offsetTop;
  }
  return { 'left' : left_offset, 'top' : top_offset };
}

function fetch_dimensions(o) {
  var w = o.offsetWidth;
  var h = o.offsetHeight;
  return { 'w' : w, 'h' : h };
}

function findParentForm(o)
{
  if ( o.tagName == 'FORM' )
    return o;
  while(true)
  {
    o = o.parentNode;
    if ( !o )
      return false;
    if ( o.tagName == 'FORM' )
      return o;
  }
  return false;
}

function ajaxReverseDNS(o, text)
{
  if(text) var ipaddr = text;
  else var ipaddr = o.innerHTML;
  rDnsObj = o;
  rDnsBannerObj = bannerOn('Retrieving reverse DNS info...');
  ajaxGet(stdAjaxPrefix+'&_mode=rdns&ip='+ipaddr, function() {
      if ( ajax.readyState == 4 && ajax.status == 200 )
      {
        off = fetch_offset(rDnsObj);
        dim = fetch_dimensions(rDnsObj);
        right = off['left'] + dim['w'];
        top = off['top'] + dim['h'];
        var thediv = document.createElement('div');
        thediv.className = 'info-box';
        thediv.style.margin = '0';
        thediv.style.position = 'absolute';
        thediv.style.top  = top  + 'px';
        thediv.style.display = 'none';
        thediv.style.zIndex = getHighestZ() + 2;
        thediv.id = 'mdgDynamic_rDnsInfoDiv_'+Math.floor(Math.random() * 1000000);
        thediv.innerHTML = '<b>Reverse DNS:</b><br />'+ajax.responseText+' <a href="#" onclick="elem = document.getElementById(\''+thediv.id+'\'); elem.innerHTML = \'\'; elem.style.display = \'none\';return false;">Close</a>';
        var body = document.getElementsByTagName('body');
        body = body[0];
        bannerOff(rDnsBannerObj);
        body.appendChild(thediv);
        thediv.style.display = 'block';
        left = fetch_dimensions(thediv);
        thediv.style.display = 'none';
        left = right - left['w'];
        thediv.style.left = left + 'px';
        thediv.style.display = 'block';
        fadeInfoBoxes();
      }
    });
}

function bannerOn(text)
{
  darken(true);
  var thediv = document.createElement('div');
  thediv.className = 'mdg-comment';
  thediv.style.padding = '0';
  thediv.style.marginLeft = '0';
  thediv.style.position = 'absolute';
  thediv.style.display = 'none';
  thediv.style.padding = '4px';
  thediv.style.fontSize = '14pt';
  thediv.id = 'mdgDynamic_bannerDiv_'+Math.floor(Math.random() * 1000000);
  thediv.innerHTML = text;
  
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.appendChild(thediv);
  body.style.cursor = 'wait';
  
  thediv.style.display = 'block';
  dim = fetch_dimensions(thediv);
  thediv.style.display = 'none';
  bdim = { 'w' : getWidth(), 'h' : getHeight() };
  so = getScrollOffset();
  
  var left = (bdim['w'] / 2) - ( dim['w'] / 2 );
  
  var top  = (bdim['h'] / 2);
  top  = top - ( dim['h'] / 2 );
  
  top = top + so;
  
  thediv.style.top  = top  + 'px';
  thediv.style.left = left + 'px';
  
  thediv.style.display = 'block';
  
  return thediv.id;
}

function bannerOff(id)
{
  e = document.getElementById(id);
  if(!e) return;
  e.innerHTML = '';
  e.style.display = 'none';
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'default';
  enlighten(true);
}

function disableUnload(message)
{
  if(typeof message != 'string') message = 'You may want to save your changes first.';
  window._unloadmsg = message;
  window.onbeforeunload = function(e)
  {
    if ( !e )
      e = window.event;
    e.returnValue = window._unloadmsg;
  }
}

function enableUnload()
{
  window._unloadmsg = null;
  window.onbeforeunload = null;
}

/**
 * Gets the highest z-index of all divs in the document
 * @return integer
 */
function getHighestZ()
{
  z = 0;
  var divs = document.getElementsByTagName('div');
  for(var i = 0; i < divs.length; i++)
  {
    if(divs[i].style.zIndex > z) z = divs[i].style.zIndex;
  }
  return z;
}

function isKeyPressed(event)
{
  if (event.shiftKey==1)
  {
    shift = true;
  }
  else
  {
    shift = false;
  }
}

function moveDiv(div, newparent)
{
  var backup = div;
  var oldparent = div.parentNode;
  oldparent.removeChild(div);
  newparent.appendChild(backup);
}

function readCookie(name) {var nameEQ = name + "=";var ca = document.cookie.split(';');for(var i=0;i < ca.length;i++){var c = ca[i];while (c.charAt(0)==' ') c = c.substring(1,c.length);if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);}return null;}
function createCookie(name,value,days){if (days){var date = new Date();date.setTime(date.getTime()+(days*24*60*60*1000));var expires = "; expires="+date.toGMTString();}else var expires = "";document.cookie = name+"="+value+expires+"; path=/";}
function eraseCookie(name) {createCookie(name,"",-1);}

var busyBannerID;
function goBusy(msg)
{
  if(!msg) msg = 'Please wait...';
  body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'wait';
  busyBannerID = bannerOn(msg);
}

function unBusy()
{
  body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'default';
  bannerOff(busyBannerID);
}

function setAjaxLoading()
{
  if ( document.getElementById('ajaxloadicon') )
  {
    document.getElementById('ajaxloadicon').src=ajax_load_icon;
  }
}

function unsetAjaxLoading()
{
  if ( document.getElementById('ajaxloadicon') )
  {
    document.getElementById('ajaxloadicon').src=scriptPath + '/images/spacer.gif';
  }
}

/*
 * Search boxes
 */
 
function buildSearchBoxes()
{
  var divs = document.getElementsByTagName('*');
  var boxes = new Array();
  for ( var i = 0; i < divs.length; i++ )
  {
    if ( divs[i].className)
    {
      if ( divs[i].className.substr(0, 9) == 'searchbox' )
      {
        boxes.push(divs[i]);
      }
    }
  }
  for ( var i = 0; i < boxes.length; i++ )
  {
    if ( boxes[i].className.match(/^searchbox\[([0-9]+)px\]$/) )
    {
      var width = boxes[i].className.match(/^searchbox\[([0-9]+)px\]$/);
      width = parseInt(width[1]);
    }
    else
    {
      var width = 120;
    }
    createSearchBox(boxes[i], width);
  }
}

function createSearchBox(parent, width)
{
  if ( typeof(parent) != 'object')
  {
    alert('BUG: createSearchBox(): parent is not an object');
    return false;
  }
  //parent.style.padding = '0px';
  //parent.style.textAlign = 'center';
  parent.style.width = width + 'px';
  var submit = document.createElement('div');
  submit.onclick = function() { searchFormSubmit(this); };
  submit.className = 'js-search-submit';
  var input = document.createElement('input');
  input.className = 'js-search-box';
  input.value = 'Search';
  input.name = 'q';
  input.style.width = ( width - 28 ) + 'px';
  input.onfocus = function() { if ( this.value == 'Search' ) this.value = ''; };
  input.onblur  = function() { if ( this.value == '' ) this.value = 'Search'; };
  parent.appendChild(input);
  var off = fetch_offset(input);
  var top = off['top'] + 'px';
  var left = ( parseInt(off['left']) + ( width - 24 ) ) + 'px';
  submit.style.top = top;
  submit.style.left = left;
  parent.appendChild(submit);
}

function searchFormSubmit(obj)
{
  var input = obj.previousSibling;
  if ( input.value == 'Search' || input.value == '' )
    return false;
  var p = obj;
  while(true)
  {
    p = p.parentNode;
    if ( !p )
      break;
    if ( typeof(p.tagName) != 'string' )
      break;
    else if ( p.tagName.toLowerCase() == 'form' )
    {
      p.submit();
    }
    else if ( p.tagName.toLowerCase() == 'body' )
    {
      break;
    }
  }
}

/*
 * AJAX login box (experimental)
 */

var ajax_auth_prompt_cache = false;
var ajax_auth_mb_cache = false;
var ajax_auth_level_cache = false;
var ajax_auth_error_string = false;
var ajax_auth_show_captcha = false;

function ajaxAuthErrorToString($data)
{
  var $errstring = $data.error;
  // this was literally copied straight from the PHP code.
  switch($data.error)
  {
    case 'key_not_found':
      $errstring = $lang.get('user_err_key_not_found');
      break;
    case 'key_wrong_length':
      $errstring = $lang.get('user_err_key_wrong_length');
      break;
    case 'too_big_for_britches':
      $errstring = $lang.get('user_err_too_big_for_britches');
      break;
    case 'invalid_credentials':
      $errstring = $lang.get('user_err_invalid_credentials');
      var subst = {
        fails: $data.lockout_fails,
        lockout_threshold: $data.lockout_threshold,
        lockout_duration: $data.lockout_duration
      }
      if ( $data.lockout_policy == 'lockout' )
      {
        $errstring += $lang.get('user_err_invalid_credentials_lockout', subst);
      }
      else if ( $data.lockout_policy == 'captcha' )
      {
        $errstring += $lang.get('user_err_invalid_credentials_lockout_captcha', subst);
      }
      break;
    case 'backend_fail':
      $errstring = $lang.get('user_err_backend_fail');
      break;
    case 'locked_out':
      $attempts = parseInt($data['lockout_fails']);
      if ( $attempts > $data['lockout_threshold'])
        $attempts = $data['lockout_threshold'];
      $time_rem = $data.time_rem;
      $s = ( $time_rem == 1 ) ? '' : $lang.get('meta_plural');
      
      var subst = {
        lockout_threshold: $data.lockout_threshold,
        time_rem: $time_rem,
        plural: $s,
        captcha_blurb: ( $data.lockout_policy == 'captcha' ? $lang.get('user_err_locked_out_captcha_blurb') : '' )
      }
      
      $errstring = $lang.get('user_err_locked_out', subst);
      
      break;
  }
  return $errstring;
}

function ajaxPromptAdminAuth(call_on_ok, level)
{
  if ( typeof(call_on_ok) == 'function' )
  {
    ajax_auth_prompt_cache = call_on_ok;
  }
  if ( !level )
    level = USER_LEVEL_MEMBER;
  ajax_auth_level_cache = level;
  var loading_win = '<div align="center" style="text-align: center;"> \
      <p>' + $lang.get('user_login_ajax_fetching_key') + '</p> \
      <p><small>' + $lang.get('user_login_ajax_link_fullform', { link_full_form: makeUrlNS('Special', 'Login/' + title) }) + '</p> \
      <p><img alt="Please wait..." src="'+scriptPath+'/images/loading-big.gif" /></p> \
    </div>';
  var title = ( level > USER_LEVEL_MEMBER ) ? $lang.get('user_login_ajax_prompt_title_elev') : $lang.get('user_login_ajax_prompt_title');
  ajax_auth_mb_cache = new messagebox(MB_OKCANCEL|MB_ICONLOCK, title, loading_win);
  ajax_auth_mb_cache.onbeforeclick['OK'] = ajaxValidateLogin;
  ajax_auth_mb_cache.onbeforeclick['Cancel'] = function()
  {
    if ( document.getElementById('autoCaptcha') )
    {
      var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
      setTimeout(function() {
          var d = document.getElementById('autoCaptcha');
          d.parentNode.removeChild(d);
        }, to);
    }
  }
  ajaxAuthLoginInnerSetup();
}

function ajaxAuthLoginInnerSetup()
{
  // let's hope this gets the image cached
  var _ = new Image(32, 32); 
  _.src = scriptPath + "/images/check.png";
  
  ajaxGet(makeUrlNS('Special', 'Login', 'act=getkey'), function() {
      if ( ajax.readyState == 4 && ajax.status == 200 )
      {
        var response = String(ajax.responseText);
        if ( response.substr(0,1) != '{' )
        {
          handle_invalid_json(response);
          ajax_auth_mb_cache.destroy();
          return false;
        }
        response = parseJSON(response);
        var disable_controls = false;
        if ( response.locked_out && !ajax_auth_error_string )
        {
          response.error = 'locked_out';
          ajax_auth_error_string = ajaxAuthErrorToString(response);
          if ( response.lockout_policy == 'captcha' )
          {
            ajax_auth_show_captcha = response.captcha;
          }
          else
          {
            disable_controls = true;
          }
        }
        var level = ajax_auth_level_cache;
        var form_html = '';
        var shown_error = false;
        if ( ajax_auth_error_string )
        {
          shown_error = true;
          form_html += '<div class="error-box-mini" id="ajax_auth_error">' + ajax_auth_error_string + '</div>';
          ajax_auth_error_string = false;
        }
        else if ( level > USER_LEVEL_MEMBER )
        {
          form_html += $lang.get('user_login_ajax_prompt_body_elev') + '<br /><br />';
        }
        if ( ajax_auth_show_captcha )
         {
           var captcha_html = ' \
             <tr> \
               <td>' + $lang.get('user_login_field_captcha') + ':</td> \
               <td><input type="hidden" id="ajaxlogin_captcha_hash" value="' + ajax_auth_show_captcha + '" /><input type="text" tabindex="3" size="25" id="ajaxlogin_captcha_code" /> \
             </tr>';
         }
         else
         {
           var captcha_html = '';
         }
         var disableme = ( disable_controls ) ? 'disabled="disabled" ' : '';
        form_html += ' \
          <form action="#" onsubmit="ajaxValidateLogin(); return false;" name="ajax_login_form"> \
            <table border="0" align="center"> \
              <tr> \
                <td>' + $lang.get('user_login_field_username') + ':</td><td><input tabindex="1" id="ajaxlogin_user" type="text"     ' + disableme + 'size="25" /> \
              </tr> \
              <tr> \
                <td>' + $lang.get('user_login_field_password') + ':</td><td><input tabindex="2" id="ajaxlogin_pass" type="password" ' + disableme + 'size="25" /> \
              </tr> \
              ' + captcha_html + ' \
              <tr> \
                <td colspan="2" style="text-align: center;"> \
                <small>' + $lang.get('user_login_ajax_link_fullform', { link_full_form: makeUrlNS('Special', 'Login/' + title, 'level=' + level) }) + '<br />';
       if ( level <= USER_LEVEL_MEMBER )
       {
         form_html += ' \
                  ' + $lang.get('user_login_ajax_link_forgotpass', { forgotpass_link: makeUrlNS('Special', 'PasswordReset') }) + '<br /> \
                  ' + $lang.get('user_login_createaccount_blurb', { reg_link: makeUrlNS('Special', 'Register') });
       }
       form_html += '</small> \
                </td> \
              </tr> \
            </table> \
            <input type="hidden" id="ajaxlogin_crypt_key"       value="' + response.key + '" /> \
            <input type="hidden" id="ajaxlogin_crypt_challenge" value="' + response.challenge + '" /> \
          </form>';
        ajax_auth_mb_cache.updateContent(form_html);
        $dynano('messageBox').object.nextSibling.firstChild.tabindex = '3';
        if ( typeof(response.username) == 'string' )
        {
          $dynano('ajaxlogin_user').object.value = response.username;
          if ( IE )
          {
            setTimeout("document.forms['ajax_login_form'].password.focus();", 200);
          }
          else
          {
            $dynano('ajaxlogin_pass').object.focus();
          }
        }
        else
        {
          if ( IE )
          {
            setTimeout("document.forms['ajax_login_form'].username.focus();", 200);
          }
          else
          {
            $dynano('ajaxlogin_user').object.focus();
          }
        }
        var enter_obj = ( ajax_auth_show_captcha ) ? 'ajaxlogin_captcha_code' : 'ajaxlogin_pass';
        $dynano(enter_obj).object.onblur = function(e) { if ( !shift ) $dynano('messageBox').object.nextSibling.firstChild.focus(); };
        $dynano(enter_obj).object.onkeypress = function(e)
        {
          // Trigger a form submit when the password field is focused and the user presses enter
          
          // IE doesn't give us an event object when it should - check window.event. If that
          // still fails, give up.
          if ( !e )
          {
            e = window.event;
          }
          if ( !e && IE )
          {
            return true;
          }
          if ( e.keyCode == 13 )
          {
            ajaxValidateLogin();
          }
        };
        /*
        ## This causes the background image to disappear under Fx 2
        if ( shown_error )
        {
          // fade to #FFF4F4
          var fader = new Spry.Effect.Highlight('ajax_auth_error', {duration: 1000, from: '#FFF4F4', to: '#805600', restoreColor: '#805600', finish: function()
              {
                var fader = new Spry.Effect.Highlight('ajax_auth_error', {duration: 3000, from: '#805600', to: '#FFF4F4', restoreColor: '#FFF4F4'});
                fader.start();
          }});
          fader.start();
        }
        */
        if ( ajax_auth_show_captcha )
        {
          ajaxShowCaptcha(ajax_auth_show_captcha);
          ajax_auth_show_captcha = false;
        }
      }
    });
}

function ajaxValidateLogin()
{
  var username,password,auth_enabled,crypt_key,crypt_data,challenge_salt,challenge_data;
  username = document.getElementById('ajaxlogin_user');
  if ( !username )
    return false;
  username = document.getElementById('ajaxlogin_user').value;
  password = document.getElementById('ajaxlogin_pass').value;
  auth_enabled = false;
  
  if ( document.getElementById('autoCaptcha') )
  {
    var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
    setTimeout(function() {
        var d = document.getElementById('autoCaptcha');
        d.parentNode.removeChild(d);
      }, to);
  }
  
  disableJSONExts();
  
  var auth_enabled = aes_self_test();
  
  if ( !auth_enabled )
  {
    alert('Login error: encryption sanity check failed\n');
    return true;
  }
  
  crypt_key = document.getElementById('ajaxlogin_crypt_key').value;
  challenge_salt = document.getElementById('ajaxlogin_crypt_challenge').value;
  
  var crypt_key_md5 = hex_md5(crypt_key);
  
  challenge_data = hex_md5(password + challenge_salt) + challenge_salt;
  
  password = stringToByteArray(password);
  crypt_key = hexToByteArray(crypt_key);
  
  crypt_data = rijndaelEncrypt(password, crypt_key, 'ECB');
  crypt_data = byteArrayToHex(crypt_data);
  
  var json_data = {
    'username' : username,
    'crypt_key' : crypt_key_md5,
    'challenge' : challenge_data,
    'crypt_data' : crypt_data,
    'level' : ajax_auth_level_cache
  };
  
  if ( document.getElementById('ajaxlogin_captcha_hash') )
  {
    json_data.captcha_hash = document.getElementById('ajaxlogin_captcha_hash').value;
    json_data.captcha_code = document.getElementById('ajaxlogin_captcha_code').value;
  }
  
  json_data = toJSONString(json_data);
  json_data = encodeURIComponent(json_data);
  
  var loading_win = '<div align="center" style="text-align: center;"> \
      <p>' + $lang.get('user_login_ajax_loggingin') + '</p> \
      <p><img alt="Please wait..." src="'+scriptPath+'/images/loading-big.gif" /></p> \
    </div>';
    
  ajax_auth_mb_cache.updateContent(loading_win);
  
  ajaxPost(makeUrlNS('Special', 'Login', 'act=ajaxlogin'), 'params=' + json_data, function() {
      if ( ajax.readyState == 4 && ajax.status == 200 )
      {
        var response = ajax.responseText;
        if ( response.substr(0,1) != '{' )
        {
          alert('Invalid JSON response from server: ' + response);
          ajaxAuthLoginInnerSetup();
          return false;
        }
        response = parseJSON(response);
        switch(response.result)
        {
          case 'success':
            var success_win = '<div align="center" style="text-align: center;"> \
                  <p>' + $lang.get('user_login_success_short') + '</p> \
                  <p><img alt=" " src="'+scriptPath+'/images/check.png" /></p> \
                </div>';
            ajax_auth_mb_cache.updateContent(success_win);
            if ( typeof(ajax_auth_prompt_cache) == 'function' )
            {
              ajax_auth_prompt_cache(response.key);
            }
            break;
          case 'success_reset':
            var conf = confirm($lang.get('user_login_ajax_msg_used_temp_pass'));
            if ( conf )
            {
              var url = makeUrlNS('Special', 'PasswordReset/stage2/' + response.user_id + '/' + response.temppass);
              window.location = url;
            }
            else
            {
              ajaxAuthLoginInnerSetup();
            }
            break;
          case 'error':
            if ( response.data.error == 'invalid_credentials' || response.data.error == 'locked_out' )
            {
              ajax_auth_error_string = ajaxAuthErrorToString(response.data);
              mb_current_obj.updateContent('');
              document.getElementById('messageBox').style.backgroundColor = '#C0C0C0';
              var mb_parent = document.getElementById('messageBox').parentNode;
              new Spry.Effect.Shake(mb_parent, {duration: 1500}).start();
              setTimeout("document.getElementById('messageBox').style.backgroundColor = '#FFF'; ajaxAuthLoginInnerSetup();", 2500);
              
              if ( response.data.lockout_policy == 'captcha' && response.data.error == 'locked_out' )
              {
                ajax_auth_show_captcha = response.captcha;
              }
            }
            else
            {
              ajax_auth_error_string = ajaxAuthErrorToString(response.data);
              ajaxAuthLoginInnerSetup();
            }
            break;
          default:
            alert(ajax.responseText);
            break;
        }
      }
    });
  
  return true;
  
}

// This code is in the public domain. Feel free to link back to http://jan.moesen.nu/
function sprintf()
{
  if (!arguments || arguments.length < 1 || !RegExp)
  {
    return;
  }
  var str = arguments[0];
  var re = /([^%]*)%('.|0|\x20)?(-)?(\d+)?(\.\d+)?(%|b|c|d|u|f|o|s|x|X)(.*)/;
  var a = b = [], numSubstitutions = 0, numMatches = 0;
  while (a = re.exec(str))
  {
    var leftpart = a[1], pPad = a[2], pJustify = a[3], pMinLength = a[4];
    var pPrecision = a[5], pType = a[6], rightPart = a[7];
    
    //alert(a + '\n' + [a[0], leftpart, pPad, pJustify, pMinLength, pPrecision);

    numMatches++;
    if (pType == '%')
    {
      subst = '%';
    }
    else
    {
      numSubstitutions++;
      if (numSubstitutions >= arguments.length)
      {
        alert('Error! Not enough function arguments (' + (arguments.length - 1) + ', excluding the string)\nfor the number of substitution parameters in string (' + numSubstitutions + ' so far).');
      }
      var param = arguments[numSubstitutions];
      var pad = '';
             if (pPad && pPad.substr(0,1) == "'") pad = leftpart.substr(1,1);
        else if (pPad) pad = pPad;
      var justifyRight = true;
             if (pJustify && pJustify === "-") justifyRight = false;
      var minLength = -1;
             if (pMinLength) minLength = parseInt(pMinLength);
      var precision = -1;
             if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1));
      var subst = param;
             if (pType == 'b') subst = parseInt(param).toString(2);
        else if (pType == 'c') subst = String.fromCharCode(parseInt(param));
        else if (pType == 'd') subst = parseInt(param) ? parseInt(param) : 0;
        else if (pType == 'u') subst = Math.abs(param);
        else if (pType == 'f') subst = (precision > -1) ? Math.round(parseFloat(param) * Math.pow(10, precision)) / Math.pow(10, precision): parseFloat(param);
        else if (pType == 'o') subst = parseInt(param).toString(8);
        else if (pType == 's') subst = param;
        else if (pType == 'x') subst = ('' + parseInt(param).toString(16)).toLowerCase();
        else if (pType == 'X') subst = ('' + parseInt(param).toString(16)).toUpperCase();
    }
    str = leftpart + subst + rightPart;
  }
  return str;
}

/**
 * Insert a DOM object _after_ the specified child.
 * @param object Parent node
 * @param object Node to insert
 * @param object Node to insert after
 */

function insertAfter(parent, baby, bigsister)
{
  try
  {
    if ( parent.childNodes[parent.childNodes.length-1] == bigsister )
      parent.appendChild(baby);
    else
      parent.insertBefore(baby, bigsister.nextSibling);
  }
  catch(e)
  {
    alert(e.toString());
    if ( window.console )
    {
      // Firebug support
      window.console.warn(e);
    }
  }
}

/**
 * Validates an e-mail address.
 * @param string E-mail address
 * @return bool
 */

function validateEmail(email)
{
  return ( email.match(/^(?:[\w\d_-]+\.?)+@((?:(?:[\w\d_-]\-?)+\.)+\w{2,4}|localhost)$/) ) ? true : false;
}

/**
 * Validates a username.
 * @param string Username to test
 * @return bool
 */

function validateUsername(username)
{
  var regex = new RegExp('^[^<>&\?\'"%\n\r/]+$', '');
  return ( username.match(regex) ) ? true : false;
}

/**
 * Equivalent of PHP's time()
 * @return int
 */

function unix_time()
{
  return parseInt((new Date()).getTime()/1000);
}

/*
 * Utility functions, moved from windows.js
 */
 
// getElementWidth() and getElementHeight()
// Source: http://www.aspandjavascript.co.uk/javascript/javascript_api/get_element_width_height.asp

function getElementHeight(Elem) {
  if (ns4) 
  {
    var elem = getObjNN4(document, Elem);
    return elem.clip.height;
  } 
  else
  {
    if(document.getElementById) 
    {
      var elem = document.getElementById(Elem);
    }
    else if (document.all)
    {
      var elem = document.all[Elem];
    }
    if (op5) 
    { 
      xPos = elem.style.pixelHeight;
    }
    else
    {
      xPos = elem.offsetHeight;
    }
    return xPos;
  } 
}

function getElementWidth(Elem) {
  if (ns4) {
    var elem = getObjNN4(document, Elem);
    return elem.clip.width;
  } else {
    if(document.getElementById) {
      var elem = document.getElementById(Elem);
    } else if (document.all){
      var elem = document.all[Elem];
    }
    if (op5) {
      xPos = elem.style.pixelWidth;
    } else {
      xPos = elem.offsetWidth;
    }
    return xPos;
  }
}

function getHeight() {
  var myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    myHeight = window.innerHeight;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    myHeight = document.body.clientHeight;
  }
  return myHeight;
}

function getWidth() {
  var myWidth = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    myWidth = window.innerWidth;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientWidth ) ) {
    myWidth = document.documentElement.clientWidth;
  } else if( document.body && ( document.body.clientWidth || document.body.clientWidth ) ) {
    myWidth = document.body.clientWidth;
  }
  return myWidth;
}

/**
 * Sanitizes a page URL string so that it can safely be stored in the database.
 * @param string Page ID to sanitize
 * @return string Cleaned text
 */

function sanitize_page_id(page_id)
{
  // Remove character escapes
  page_id = dirtify_page_id(page_id);

  var regex = new RegExp('[A-Za-z0-9\\[\\]\./:;\(\)@_-]', 'g');
  pid_clean = page_id.replace(regex, 'X');
  var pid_dirty = [];
  for ( var i = 0; i < pid_clean.length; i++ )
    pid_dirty[i] = pid_clean.substr(i, 1);

  for ( var i = 0; i < pid_dirty.length; i++ )
  {
    var char = pid_dirty[i];
    if ( char == 'X' )
      continue;
    var cid = char.charCodeAt(0);
    cid = cid.toString(16).toUpperCase();
    if ( cid.length < 2 )
    {
      cid = '0' + cid;
    }
    pid_dirty[i] = "." + cid;
  }
  
  var pid_chars = [];
  for ( var i = 0; i < page_id.length; i++ )
    pid_chars[i] = page_id.substr(i, 1);
  
  var page_id_cleaned = '';

  for ( var id in pid_chars )
  {
    var char = pid_chars[id];
    if ( pid_dirty[id] == 'X' )
      page_id_cleaned += char;
    else
      page_id_cleaned += pid_dirty[id];
  }
  
  return page_id_cleaned;
}

/**
 * Removes character escapes in a page ID string
 * @param string Page ID string to dirty up
 * @return string
 */

function dirtify_page_id(page_id)
{
  // First, replace spaces with underscores
  page_id = page_id.replace(/ /g, '_');

  var matches = page_id.match(/\.[A-Fa-f0-9][A-Fa-f0-9]/g);
  
  if ( matches != null )
  {
    for ( var i = 0; i < matches.length; i++ )
    {
      var match = matches[i];
      var byt = (match.substr(1)).toUpperCase();
      var code = eval("0x" + byt);
      var regex = new RegExp('\\.' + byt, 'g');
      page_id = page_id.replace(regex, String.fromCharCode(code));
    }
  }
  
  return page_id;
}