// ######################################################################

// ## flipMenu 5.0.0 (c) J. Reijers
// ## Last modifications: 23 March 2007

// ######################################################################


// ## Degree of indentation from the left.
    flipIndentation = "25px";

// ## Padding inbetween menu items.
    flipVerticalPadding = "5px";

// ## Margin between the left of the browser and the menu.
    flipLeftMargin = "5px";

// ## Margin between the top of the browser and the menu.
    flipTopMargin = "5px";

// ## Allow multiple menus to fold out without closing all the other open ones.
    flipOpenMultipleMenus = false;

// ## Preserve the current state of the menu (requires cookies).
    flipSaveMenuState = true;

// ## Use custom images for bullets
     flipImages = true;

// ## Images to use (specify full path)
    flipImg_open   = "http://www.cs.manchester.ac.uk/images/misc/arrows/cont-10.gif";
    flipImg_closed = "http://www.cs.manchester.ac.uk/images/misc/arrows/expand-10.gif";
    flipImg_static = "http://www.cs.manchester.ac.uk/images/misc/arrows/arrow-8.gif";

// ## Initialise all flipMenus onload
    flipInitOnLoad = true;

// ## Message to display in status bar while loading
    flipLoadingMessage = "Loading...";

// ######################################################################

function alterSize(someSize, alterAmount) {
    someSize = String(someSize);
    var tmpNr = parseFloat(someSize.replace(/\D/g, ""));
    var tmpChar = someSize.replace(/\d/g, "");
    return isNaN(tmpNr) ? someSize : ((tmpNr + alterAmount) + tmpChar);
}

isIE = (String(navigator.appVersion).indexOf("MSIE") > -1);
if (!isIE) 
flipIndentation = alterSize(flipIndentation, 0);
if (!isIE) 
flipLeftMargin = alterSize(flipLeftMargin, 0);

document.write(
    "<style type=\"text/css\">" +

    "ul.nav-secondary-sectionmenu { margin-top: " + flipTopMargin + "; margin-left: " + flipLeftMargin + "; " + (flipImages ? "" : "list-style-type: none;") + " }" +
    "ul.nav-secondary-sectionmenu ul, ul.nav-secondary-sectionmenu li { padding: " + flipVerticalPadding + "; margin-left: " + flipIndentation + "; margin_right: 0px; " + (flipImages ? "" : "list-style-type: none;") + " }" +

    "li.flipFolderOpen { cursor: pointer; " + (flipImages ? "list-style-image: url(" + flipImg_open + ");" : "") + " }" +
    "li.flipFolderClosed { cursor: pointer; " + (flipImages ? "list-style-image: url(" + flipImg_closed + ");" : "") + " }" +

    "</style>"
);

if (flipImages) {
    aFlipPreloads = [];
    aFlipPreloads[0] = new Image;
    aFlipPreloads[0].src = flipImg_open;
    aFlipPreloads[1] = new Image;
    aFlipPreloads[1].src = flipImg_closed;
    aFlipPreloads[2] = new Image;
    aFlipPreloads[2].src = flipImg_static;
}

function addEvent(someObj, someEvent, someFunction) {
    if (someObj.addEventListener) { someObj.addEventListener(someEvent, someFunction, true); return true; } else if (someObj.attachEvent) return someObj.attachEvent("on" + someEvent, someFunction); else return false;
}

function openCloseFlip(theItem, newSetting, openParents) {
    if (theItem.flipID) {
        if (openParents) {
            var tmpItem = theItem;
            while (tmpItem.parentElement || tmpItem.parentNode) {
                tmpItem = (tmpItem.parentElement) ? tmpItem.parentElement : tmpItem.parentNode;
                openCloseFlip(tmpItem, newSetting);
            }
        }
        if ((theItem.className == "flipFolderOpen" && newSetting == "closed") || (theItem.className == "flipFolderClosed" && newSetting == "open")) {
            if (!theItem.childrenInitialised) {
                for (var j = 0; j < theItem.childNodes.length; j++) if (theItem.childNodes[j].nodeName == "UL" && !theItem.childNodes[j].initialised) initFlip(theItem.childNodes[j]);
                theItem.childrenInitialised = true;
            }
            theItem.getElementsByTagName("UL")[0].style.display = (newSetting == "open") ? "" : "none";
            theItem.className = newSetting == "open" ? "flipFolderOpen" : "flipFolderClosed";
        }
    }
}

function openFlip(theItem, openParents) {
    openCloseFlip(theItem, "open", openParents);
}

function closeFlip(theItem, closeParents) {
    openCloseFlip(theItem, "closed", closeParents);
}

function toggleFlip(theElement) {
    if (theElement.flipID) {
        var theItem = theElement;
        var isContained = true;
    } else {
        if (theElement && theElement.button > 0) return false;
        var theItem = (isIE) ? event.srcElement : theElement.target;

        var isContained = false;
        if (theItem.className == "flipFolderOpen" || theItem.className == "flipFolderClosed") isContained = true; else while (theItem.parentElement || theItem.parentNode) {
            if (theItem.className == "flipStatic" || theItem.className == "flipFolderOpen" || theItem.className == "flipFolderClosed") {
                isContained = (theItem.className == "flipFolderOpen" || theItem.className == "flipFolderClosed");
                break;
            }
            theItem = (theItem.parentElement) ? theItem.parentElement : theItem.parentNode;
        }
    }

    var toOpenFlip = (isContained && theItem.className == "flipFolderClosed");

    if (!flipOpenMultipleMenus && (toOpenFlip || theItem.className == "flipStatic")) {
        if (theItem.parentElement || theItem.parentNode) {
            var parentUL = (theItem.parentElement) ? theItem.parentElement : theItem.parentNode;
            for (var i = 0; i < parentUL.childNodes.length; i++) closeFlip(parentUL.childNodes[i]);
        }
    }

    if (isContained) {
        if (toOpenFlip) openFlip(theItem); else closeFlip(theItem);
    }
}

function setAllFlips(startElement, newSetting) {
    if (typeof startElement == "undefined") var startElement = document;
    if (typeof newSetting == "undefined") var newSetting = "closed";

    var aUL = startElement.getElementsByTagName("UL");
    for (var i = 0; i < aUL.length; i++) {
        var parentFlip = aUL[i].parentElement ? aUL[i].parentElement : aUL[i].parentNode;
        openCloseFlip(parentFlip, newSetting);
    }
}

function openAllFlips(startElement) {
    setAllFlips(startElement, "open");
}

function closeAllFlips(startElement) {
    setAllFlips(startElement, "closed");
}

function initFlip(startElement) {
    if (!document.createElement) return false; 

    if (!startElement || !startElement.nodeName) {
        var aUL = document.getElementsByTagName("UL");
        for (var i = 0; i < aUL.length; i++) {
            if (flipLoadingMessage != "") window.status = flipLoadingMessage + " " + parseInt((i / (aUL.length - 1)) * 100, 10) + "%";
            var curUL = aUL[i];
            if (curUL.className == "nav-secondary-sectionmenu") {
                initFlip(curUL);

                // ## Fix text selecting problem in Mozilla
                curUL.onselectstart = new Function("return false");
                curUL.onmousedown = new Function("return false");
                curUL.onclick = new Function("return true");
            }
        }

        if (flipSaveMenuState) loadMenuState();

        if (flipLoadingMessage != "") window.status = "";
        return true;
    }

    if (startElement.className == "nav-secondary-sectionmenu") startElement.style.display = "";

    if (!startElement.childNodes || startElement.childNodes.length == 0) return false;

    if (typeof flipIDCur == "undefined") flipIDCur = 0;
    if (!startElement.initialised) {
        var aUL = startElement.getElementsByTagName("UL");
        for (var i = 0; i < aUL.length; i++) aUL[i].style.display = "none";
    }

    for (var i = 0; i < startElement.childNodes.length; i++) {
        var curNode = startElement.childNodes[i];
        if (curNode.nodeName == "LI") {
            flipIDCur++;
            curNode.flipID = flipIDCur;

            var nodeHasChildren = curNode.getElementsByTagName("UL").length > 0;
            if (nodeHasChildren) {
                if (flipImages && curNode.flipClosed) curNode.style.listStyleImage = "url(" + curNode.flipClosed + ")";

                if (curNode.className == null || curNode.className == "") curNode.className = "flipFolderClosed";
            } else {
                curNode.className = "flipStatic";
                if (flipImages && !curNode.style.listStyleImage) {
                    if (!curNode.flipStatic) curNode.flipStatic = flipImg_static;
                    curNode.style.listStyleImage = "url(" + curNode.flipStatic + ")";
                }
            }

            if (!curNode.flipOpen) curNode.flipOpen = flipImg_open;
            if (!curNode.flipClosed) curNode.flipClosed = flipImg_closed;

            if (curNode.flipIsOpen) openFlip(curNode);
        }
    }

    startElement.initialised = true;
}

function rootOfFlip(flipID, startElement) {

    function containsFlip(startElement, flipID) {
        var flipFound = false;
        var i = 0;
        while (i < startElement.childNodes.length && !flipFound) {
            var curNode = startElement.childNodes[i];
            flipFound = (curNode.flipID == flipID) ? true : containsFlip(curNode, flipID);
            i++;
        }
        return flipFound;
    }

    var rootFlip = null;

    if (!startElement || !startElement.nodeName) {
        var aUL = document.getElementsByTagName("UL");
        var i = 0;
        while (rootFlip == null && i < aUL.length) {
            var curUL = aUL[i];
            if (curUL.nodeName == "UL" && curUL.className == "nav-secondary-sectionmenu") rootFlip = rootOfFlip(flipID, curUL);
            i++;
        }
        return rootFlip;
    }

    if (startElement.childNodes) for (var i = 0; i < startElement.childNodes.length; i++) {
        var curNode = startElement.childNodes[i];
        if (curNode.flipID == flipID || containsFlip(curNode, flipID)) rootFlip = curNode;
    }

    return rootFlip;
}

function getCookie(cookieName) {
    var allCookies = document.cookie;
    var indexStr = allCookies.indexOf(cookieName + "=");
    if (indexStr == -1) return "";
    indexStr = allCookies.indexOf("=", indexStr) + 1;
    var endStr = allCookies.indexOf(";", indexStr);
    if (endStr == -1) endStr = allCookies.length;
    return unescape(allCookies.substring(indexStr, endStr));
}

function inArray(someID, someArray) {
    for (var i = 0; i < someArray.length; i++) if (someArray[i] == someID) return true;
    return false;
}

function getMenuState(startElement) {
    if (!startElement.childNodes || startElement.childNodes.length == 0) return "";

    var openItems = "";
    var aUL = startElement.getElementsByTagName("UL");
    for (var i = 0; i < aUL.length; i++) {
        var curNode = aUL[i];
        var parentFlip = (curNode.parentElement) ? curNode.parentElement : curNode.parentNode;
        if (curNode.style.display == "" && parentFlip.flipID) openItems += " " + parentFlip.flipID;     
    }
    return openItems;
}

function putMenuState(startElement) {
    if (!startElement.childNodes || startElement.childNodes.length == 0) return false;

    var aUL = startElement.getElementsByTagName("UL");
    for (var i = 0; i < aUL.length; i++) {
        var curNode = aUL[i];
        var parentFlip = (curNode.parentElement) ? curNode.parentElement : curNode.parentNode;
        if (inArray(parentFlip.flipID, aOpenItems)) {
            openFlip(parentFlip);
            if (typeof prevFlipRoot == "undefined") {
                var testRoot = rootOfFlip(parentFlip.flipID);
                if (testRoot.flipID == parentFlip.flipID) prevFlipRoot = testRoot;
            }
        }
    }
}

function saveMenuState() {
    if (flipSaveMenuState) {
        var aUL = document.getElementsByTagName("UL");
        for (var i = 0; i < aUL.length; i++) {
            var curUL = aUL[i];
            var curID = curUL.id ? curUL.id : i;
            if (curUL.className == "nav-secondary-sectionmenu") document.cookie = cookiePrefix + curID + "=" + getMenuState(curUL) + ";path=" + myDomain + ";";
        }
    }
}

function loadMenuState() {
    var aUL = document.getElementsByTagName("UL");
    for (var i = 0; i < aUL.length; i++) {
        var curUL = aUL[i];
        var curID = curUL.id ? curUL.id : i;
        if (curUL.className == "nav-secondary-sectionmenu") {
            var savedState = String(getCookie(cookiePrefix + curID));
            if (savedState != "") {
                aOpenItems = savedState.split(" ");
                putMenuState(curUL);
            }
        }
    }

    addEvent(window, "unload", saveMenuState);
}

function clearMenuState(flipMenuID) {
    if (typeof flipMenuID == "undefined") {
        var aUL = document.getElementsByTagName("UL");
        for (var i = 0; i < aUL.length; i++) {
            var curUL = aUL[i];
            var curID = curUL.id ? curUL.id : i;
            if (curUL.className == "nav-secondary-sectionmenu") document.cookie = cookiePrefix + curID + "=;path=" + myDomain + ";";
        }
    } else document.cookie = cookiePrefix + flipMenuID + "=;";
}

function buildDomain() {
domainPrefix = document.location.pathname;
aSplitPath=domainPrefix.split("/");
return "/" + aSplitPath[1];
}

//cookiePrefix = document.location.pathname + "_";
cookiePrefix =  "cs-js-menu_";
myDomain = buildDomain();


addEvent(document, "click", toggleFlip);
if (flipInitOnLoad) addEvent(window, "load", initFlip);