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";
    }
}