var smf_formSubmitted = false;

// Define document.getElementById for Internet Explorer 4.
if (typeof(document.getElementById) == "undefined")
 document.getElementById = function (id)
 {
  // Just return the corresponding index of all.
  return document.all[id];
 }
// Define XMLHttpRequest for IE 5 and above. (don't bother for IE 4 :/.... works in Opera 7.6 and Safari 1.2!)
else if (!window.XMLHttpRequest && window.ActiveXObject)
 window.XMLHttpRequest = function ()
 {
  return new ActiveXObject(navigator.userAgent.indexOf("MSIE 5") != -1 ? "Microsoft.XMLHTTP" : "MSXML2.XMLHTTP");
 };

// Some older versions of Mozilla don't have this, for some reason.
if (typeof(document.forms) == "undefined")
 document.forms = document.getElementsByTagName("form");

// Load an XML document using XMLHttpRequest.
function getXMLDocument(url, callback)
{
 if (!window.XMLHttpRequest)
  return false;

 var myDoc = new XMLHttpRequest();
 if (typeof(callback) != "undefined")
 {
  myDoc.onreadystatechange = function ()
  {
   if (myDoc.readyState != 4)
    return;

   if (myDoc.responseXML != null && myDoc.status == 200)
    callback(myDoc.responseXML);
  };
 }
 myDoc.open('GET', url, true);
 myDoc.send(null);

 return true;
}

// Send a post form to the server using XMLHttpRequest.
function sendXMLDocument(url, content, callback)
{
 if (!window.XMLHttpRequest)
  return false;

 var sendDoc = new window.XMLHttpRequest();
 if (typeof(callback) != "undefined")
 {
  sendDoc.onreadystatechange = function ()
  {
   if (sendDoc.readyState != 4)
    return;

   if (sendDoc.responseXML != null && sendDoc.status == 200)
    callback(sendDoc.responseXML);
   else
    callback(false);
  };
 }
 sendDoc.open('POST', url, true);
 if (typeof(sendDoc.setRequestHeader) != "undefined")
  sendDoc.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
 sendDoc.send(content);

 return true;
}

function textToEntities(text)
{
 var entities = "";
 for (var i = 0; i < text.length; i++)
 {
  if (text.charCodeAt(i) > 127)
   entities += "&#" + text.charCodeAt(i) + ";";
  else
   entities += text.charAt(i);
 }

 return entities;
}

// Open a new window.
function reqWin(desktopURL, alternateWidth, alternateHeight, noScrollbars)
{
 if ((alternateWidth && self.screen.availWidth * 0.8 < alternateWidth) || (alternateHeight && self.screen.availHeight * 0.8 < alternateHeight))
 {
  noScrollbars = false;
  alternateWidth = Math.min(alternateWidth, self.screen.availWidth * 0.8);
  alternateHeight = Math.min(alternateHeight, self.screen.availHeight * 0.8);
 }
 else
  noScrollbars = typeof(noScrollbars) != "undefined" && noScrollbars == true;

 window.open(desktopURL, 'requested_popup', 'toolbar=no,location=no,status=no,menubar=no,scrollbars=' + (noScrollbars ? 'no' : 'yes') + ',width=' + (alternateWidth ? alternateWidth : 480) + ',height=' + (alternateHeight ? alternateHeight : 220) + ',resizable=no');

 // Return false so the click won't follow the link ;).
 return false;
}

// Remember the current position.
function storeCaret(text)
{
 // Only bother if it will be useful.
 if (typeof(text.createTextRange) != "undefined")
  text.caretPos = document.selection.createRange().duplicate();
}

// Replaces the currently selected text with the passed text.
function replaceText(text, textarea)
{
 // Attempt to create a text range (IE).
 if (typeof(textarea.caretPos) != "undefined" && textarea.createTextRange)
 {
  var caretPos = textarea.caretPos;

  caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? text + ' ' : text;
  caretPos.select();
 }
 // Mozilla text range replace.
 else if (typeof(textarea.selectionStart) != "undefined")
 {
  var begin = textarea.value.substr(0, textarea.selectionStart);
  var end = textarea.value.substr(textarea.selectionEnd);
  var scrollPos = textarea.scrollTop;

  textarea.value = begin + text + end;

  if (textarea.setSelectionRange)
  {
   textarea.focus();
   textarea.setSelectionRange(begin.length + text.length, begin.length + text.length);
  }
  textarea.scrollTop = scrollPos;
 }
 // Just put it on the end.
 else
 {
  textarea.value += text;
  textarea.focus(textarea.value.length - 1);
 }
}

// Surrounds the selected text with text1 and text2.
function surroundText(text1, text2, textarea)
{
 // Can a text range be created?
 if (typeof(textarea.caretPos) != "undefined" && textarea.createTextRange)
 {
  var caretPos = textarea.caretPos, temp_length = caretPos.text.length;

  caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? text1 + caretPos.text + text2 + ' ' : text1 + caretPos.text + text2;

  if (temp_length == 0)
  {
   caretPos.moveStart("character", -text2.length);
   caretPos.moveEnd("character", -text2.length);
   caretPos.select();
  }
  else
   textarea.focus(caretPos);
 }
 // Mozilla text range wrap.
 else if (typeof(textarea.selectionStart) != "undefined")
 {
  var begin = textarea.value.substr(0, textarea.selectionStart);
  var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
  var end = textarea.value.substr(textarea.selectionEnd);
  var newCursorPos = textarea.selectionStart;
  var scrollPos = textarea.scrollTop;

  textarea.value = begin + text1 + selection + text2 + end;

  if (textarea.setSelectionRange)
  {
   if (selection.length == 0)
    textarea.setSelectionRange(newCursorPos + text1.length, newCursorPos + text1.length);
   else
    textarea.setSelectionRange(newCursorPos, newCursorPos + text1.length + selection.length + text2.length);
   textarea.focus();
  }
  textarea.scrollTop = scrollPos;
 }
 // Just put them on the end, then.
 else
 {
  textarea.value += text1 + text2;
  textarea.focus(textarea.value.length - 1);
 }
}

// Checks if the passed input's value is nothing.
function isEmptyText(theField)
{
 // Copy the value so changes can be made..
 var theValue = theField.value;

 // Strip whitespace off the left side.
 while (theValue.length > 0 && (theValue.charAt(0) == ' ' || theValue.charAt(0) == '\t'))
  theValue = theValue.substring(1, theValue.length);
 // Strip whitespace off the right side.
 while (theValue.length > 0 && (theValue.charAt(theValue.length - 1) == ' ' || theValue.charAt(theValue.length - 1) == '\t'))
  theValue = theValue.substring(0, theValue.length - 1);

 if (theValue == '')
  return true;
 else
  return false;
}

// Only allow form submission ONCE.
function submitonce(theform)
{
 smf_formSubmitted = true;
}
function submitThisOnce(form)
{
 // Hateful, hateful fix for Safari 1.3 beta.
 if (navigator.userAgent.indexOf('AppleWebKit') != -1)
  return !smf_formSubmitted;

 if (typeof(form.form) != "undefined")
  form = form.form;

 for (var i = 0; i < form.length; i++)
  if (typeof(form[i]) != "undefined" && form[i].tagName.toLowerCase() == "textarea")
   form[i].readOnly = true;

 return !smf_formSubmitted;
}

// Set the "inside" HTML of an element.
function setInnerHTML(element, toValue)
{
 // IE has this built in...
 if (typeof(element.innerHTML) != 'undefined')
  element.innerHTML = toValue;
 // Otherwise, try createContextualFragment().
 else
 {
  var range = document.createRange();
  range.selectNodeContents(element);
  range.deleteContents();
  element.appendChild(range.createContextualFragment(toValue));
 }
}

// Set the "outer" HTML of an element.
function setOuterHTML(element, toValue)
{
 if (typeof(element.outerHTML) != 'undefined')
  element.outerHTML = toValue;
 else
 {
  var range = document.createRange();
  range.setStartBefore(element);
  element.parentNode.replaceChild(range.createContextualFragment(toValue), element);
 }
}

// Get the inner HTML of an element.
function getInnerHTML(element)
{
 if (typeof(element.innerHTML) != 'undefined')
  return element.innerHTML;
 else
 {
  var returnStr = '';
  for (var i = 0; i < element.childNodes.length; i++)
   returnStr += getOuterHTML(element.childNodes[i]);

  return returnStr;
 }
}

function getOuterHTML(node)
{
 if (typeof(node.outerHTML) != 'undefined')
  return node.outerHTML;

 var str = '';

 switch (node.nodeType)
 {
 // An element.
 case 1:
  str += '<' + node.nodeName;

  for (var i = 0; i < node.attributes.length; i++)
  {
   if (node.attributes[i].nodeValue != null)
    str += ' ' + node.attributes[i].nodeName + '="' + node.attributes[i].nodeValue + '"';
  }

  if (node.childNodes.length == 0 && in_array(node.nodeName.toLowerCase(), ['hr', 'input', 'img', 'link', 'meta', 'br']))
   str += ' />';
  else
   str += '>' + getInnerHTML(node) + '</' + node.nodeName + '>';
  break;

 // 2 is an attribute.

 // Just some text..
 case 3:
  str += node.nodeValue;
  break;

 // A CDATA section.
 case 4:
  str += '<![CDATA' + '[' + node.nodeValue + ']' + ']>';
  break;

 // Entity reference..
 case 5:
  str += '&' + node.nodeName + ';';
  break;

 // 6 is an actual entity, 7 is a PI.

 // Comment.
 case 8:
  str += '<!--' + node.nodeValue + '-->';
  break;
 }

 return str;
}

// Checks for variable in theArray.
function in_array(variable, theArray)
{
 for (var i = 0; i < theArray.length; i++)
 {
  if (theArray[i] == variable)
   return true;
 }
 return false;
}

// Find a specific radio button in its group and select it.
function selectRadioByName(radioGroup, name)
{
 if (typeof(radioGroup.length) == "undefined")
  return radioGroup.checked = true;

 for (var i = 0; i < radioGroup.length; i++)
 {
  if (radioGroup[i].value == name)
   return radioGroup[i].checked = true;
 }

 return false;
}

// Invert all checkboxes at once by clicking a single checkbox.
function invertAll(headerfield, checkform, mask)
{
 for (var i = 0; i < checkform.length; i++)
 {
  if (typeof(checkform[i].name) == "undefined" || (typeof(mask) != "undefined" && checkform[i].name.substr(0, mask.length) != mask))
   continue;

  if (!checkform[i].disabled)
   checkform[i].checked = headerfield.checked;
 }
}

// Keep the session alive - always!
var lastKeepAliveCheck = new Date().getTime();
function smf_sessionKeepAlive()
{
 var curTime = new Date().getTime();

 // Prevent a Firefox bug from hammering the server.
 if (smf_scripturl && curTime - lastKeepAliveCheck > 900000)
 {
  var tempImage = new Image();
  tempImage.src = smf_scripturl + (smf_scripturl.indexOf("?") == -1 ? "?" : "&") + "action=keepalive;" + curTime;
  lastKeepAliveCheck = curTime;
 }

 window.setTimeout("smf_sessionKeepAlive();", 1200000);
}
window.setTimeout("smf_sessionKeepAlive();", 1200000);

// Set a theme option through javascript.
function smf_setThemeOption(option, value, theme, cur_session_id)
{
 // Compatibility.
 if (cur_session_id == null)
  cur_session_id = smf_session_id;

 var tempImage = new Image();
 tempImage.src = smf_scripturl + (smf_scripturl.indexOf("?") == -1 ? "?" : "&") + "action=jsoption;var=" + option + ";val=" + value + ";sesc=" + cur_session_id + (theme == null ? "" : "&id=" + theme) + ";" + (new Date().getTime());
}

function smf_avatarResize()
{
 var possibleAvatars = document.getElementsByTagName ? document.getElementsByTagName("img") : document.all.tags("img");

 for (var i = 0; i < possibleAvatars.length; i++)
 {
  if (possibleAvatars[i].className != "avatar")
   continue;

  var tempAvatar = new Image();
  tempAvatar.src = possibleAvatars[i].src;

  if (smf_avatarMaxWidth != 0 && tempAvatar.width > smf_avatarMaxWidth)
  {
   possibleAvatars[i].height = (smf_avatarMaxWidth * tempAvatar.height) / tempAvatar.width;
   possibleAvatars[i].width = smf_avatarMaxWidth;
  }
  else if (smf_avatarMaxHeight != 0 && tempAvatar.height > smf_avatarMaxHeight)
  {
   possibleAvatars[i].width = (smf_avatarMaxHeight * tempAvatar.width) / tempAvatar.height;
   possibleAvatars[i].height = smf_avatarMaxHeight;
  }
  else
  {
   possibleAvatars[i].width = tempAvatar.width;
   possibleAvatars[i].height = tempAvatar.height;
  }
 }

 if (typeof(window_oldAvatarOnload) != "undefined" && window_oldAvatarOnload)
 {
  window_oldAvatarOnload();
  window_oldAvatarOnload = null;
 }
}

function hashLoginPassword(doForm, cur_session_id)
{
 // Compatibility.
 if (cur_session_id == null)
  cur_session_id = smf_session_id;

 if (typeof(hex_sha1) == "undefined")
  return;
 // Are they using an email address?
 if (doForm.user.value.indexOf("@") != -1)
  return;

 // Unless the browser is Opera, the password will not save properly.
 if (typeof(window.opera) == "undefined")
  doForm.passwrd.autocomplete = "off";

 doForm.hash_passwrd.value = hex_sha1(hex_sha1(doForm.user.value.php_to8bit().php_strtolower() + doForm.passwrd.value.php_to8bit()) + cur_session_id);

 // It looks nicer to fill it with asterisks, but Firefox will try to save that.
 if (navigator.userAgent.indexOf("Firefox/") != -1)
  doForm.passwrd.value = "";
 else
  doForm.passwrd.value = doForm.passwrd.value.replace(/./g, "*");
}

function hashAdminPassword(doForm, username, cur_session_id)
{
 // Compatibility.
 if (cur_session_id == null)
  cur_session_id = smf_session_id;

 if (typeof(hex_sha1) == "undefined")
  return;

 doForm.admin_hash_pass.value = hex_sha1(hex_sha1(username.toLowerCase() + doForm.admin_pass.value) + cur_session_id);
 doForm.admin_pass.value = doForm.admin_pass.value.replace(/./g, "*");
}

function ajax_indicator(turn_on)
{
 var indicator = document.getElementById("ajax_in_progress");
 if (indicator != null)
 {
  if (navigator.appName == "Microsoft Internet Explorer" && navigator.userAgent.indexOf("MSIE 7") == -1)
  {
   indicator.style.top = document.documentElement.scrollTop;
  }
  indicator.style.display = turn_on ? "block" : "none";
 }
}