var persisteduls = new Object()
var ddtreemenu = new Object()

ddtreemenu.closefolder = "/images/closed.gif" // set image path to
// "closed" folder image
ddtreemenu.openfolder = "/images/open.gif" // set image path to "open"
// folder image

// ////////No need to edit beyond here///////////////////////////

ddtreemenu.createTree = function(treeid, enablepersist, persistdays) {
    var ultags = document.getElementById(treeid).getElementsByTagName("ul")
    if (typeof persisteduls[treeid] == "undefined")
        persisteduls[treeid] = (enablepersist == true && ddtreemenu
            .getCookie(treeid) != "") ? ddtreemenu.getCookie(treeid).split(
            ",") : ""
    for ( var i = 0; i < ultags.length; i++)
        ddtreemenu.buildSubTree(treeid, ultags[i], i)
    if (enablepersist == true) { // if enable persist feature
        var durationdays = (typeof persistdays == "undefined") ? 1
        : parseInt(persistdays)
        ddtreemenu.dotask(window, function() {
            ddtreemenu.rememberstate(treeid, durationdays)
        }, "unload") // save opened UL indexes on body unload
    }
}

ddtreemenu.buildSubTree = function(treeid, ulelement, index) {
    ulelement.parentNode.className = "submenu"
    if (typeof persisteduls[treeid] == "object") { // if cookie exists
        // (persisteduls[treeid] is
        // an array versus ""
        // string)
        if (ddtreemenu.searcharray(persisteduls[treeid], index)) {
            ulelement.setAttribute("rel", "open")
            ulelement.style.display = "block"
            ulelement.parentNode.style.backgroundImage = "url("
            + ddtreemenu.openfolder + ")"
        } else
            ulelement.setAttribute("rel", "closed")
    } // end cookie persist code
    else if (ulelement.getAttribute("rel") == null
        || ulelement.getAttribute("rel") == false) // if no cookie and UL
        // has NO rel attribute
        // explicted added by
        // user
        ulelement.setAttribute("rel", "closed")
    else if (ulelement.getAttribute("rel") == "open") // else if no cookie and
        // this UL has an
        // explicit rel value of
        // "open"
        ddtreemenu.expandSubTree(treeid, ulelement) // expand this UL plus all
    // parent ULs (so the most
    // inner UL is revealed!)
    ulelement.parentNode.onclick = function(e) {
        var submenu = this.getElementsByTagName("ul")[0]
        if (submenu.getAttribute("rel") == "closed") {
            submenu.style.display = "block"
            submenu.setAttribute("rel", "open")
            ulelement.parentNode.style.backgroundImage = "url("
            + ddtreemenu.openfolder + ")"
        } else if (submenu.getAttribute("rel") == "open") {
            submenu.style.display = "none"
            submenu.setAttribute("rel", "closed")
            ulelement.parentNode.style.backgroundImage = "url("
            + ddtreemenu.closefolder + ")"
        }
        ddtreemenu.preventpropagate(e)
    }
    ulelement.onclick = function(e) {
        ddtreemenu.preventpropagate(e)
    }
}

ddtreemenu.expandSubTree = function(treeid, ulelement) { // expand a UL
    // element and any
    // of its parent ULs
    var rootnode = document.getElementById(treeid)
    var currentnode = ulelement
    currentnode.style.display = "block"
    currentnode.parentNode.style.backgroundImage = "url("
    + ddtreemenu.openfolder + ")"
    while (currentnode != rootnode) {
        if (currentnode.tagName == "UL") { // if parent node is a UL, expand it
            // too
            currentnode.style.display = "block"
            currentnode.setAttribute("rel", "open") // indicate it's open
            currentnode.parentNode.style.backgroundImage = "url("
            + ddtreemenu.openfolder + ")"
        }
        currentnode = currentnode.parentNode
    }
}

ddtreemenu.flatten = function(treeid, action) { // expand or contract all UL
    // elements
    var ultags = document.getElementById(treeid).getElementsByTagName("ul")
    for ( var i = 0; i < ultags.length; i++) {
        ultags[i].style.display = (action == "expand") ? "block" : "none"
        var relvalue = (action == "expand") ? "open" : "closed"
        ultags[i].setAttribute("rel", relvalue)
        ultags[i].parentNode.style.backgroundImage = (action == "expand") ? "url("
        + ddtreemenu.openfolder + ")"
        : "url(" + ddtreemenu.closefolder + ")"
    }
}

ddtreemenu.rememberstate = function(treeid, durationdays) { // store index of
    // opened ULs
    // relative to other
    // ULs in Tree into
    // cookie
    var ultags = document.getElementById(treeid).getElementsByTagName("ul")
    var openuls = new Array()
    for ( var i = 0; i < ultags.length; i++) {
        if (ultags[i].getAttribute("rel") == "open")
            openuls[openuls.length] = i // save the index of the opened UL
    // (relative to the entire list of ULs)
    // as an array element
    }
    if (openuls.length == 0) // if there are no opened ULs to save/persist
        openuls[0] = "none open" // set array value to string to simply
    // indicate all ULs should persist with
    // state being closed
    ddtreemenu.setCookie(treeid, openuls.join(","), durationdays) // populate
// cookie
// with
// value
// treeid=1,2,3
// etc
// (where
// 1,2...
// are the
// indexes
// of the
// opened
// ULs)
}

// //A few utility functions below//////////////////////

ddtreemenu.getCookie = function(Name) { // get cookie value
    var re = new RegExp(Name + "=[^;]+", "i"); // construct RE to search for
    // target name/value pair
    if (document.cookie.match(re)) // if cookie found
        return document.cookie.match(re)[0].split("=")[1] // return its value
    return ""
}

ddtreemenu.setCookie = function(name, value, days) { // set cookei value
    var expireDate = new Date()
    // set "expstring" to either future or past date, to set or delete cookie,
    // respectively
    var expstring = expireDate.setDate(expireDate.getDate() + parseInt(days))
    document.cookie = name + "=" + value + "; expires="
    + expireDate.toGMTString() + "; path=/";
}

ddtreemenu.searcharray = function(thearray, value) { // searches an array for
    // the entered value. If
    // found, delete value
    // from array
    var isfound = false
    for ( var i = 0; i < thearray.length; i++) {
        if (thearray[i] == value) {
            isfound = true
            thearray.shift() // delete this element from array for efficiency
            // sake
            break
        }
    }
    return isfound
}

ddtreemenu.preventpropagate = function(e) { // prevent action from bubbling
    // upwards
    if (typeof e != "undefined")
        e.stopPropagation()
    else
        event.cancelBubble = true
}

ddtreemenu.dotask = function(target, functionref, tasktype) { // assign a
    // function to
    // execute to an
    // event handler
    // (ie:
    // onunload)
    var tasktype = (window.addEventListener) ? tasktype : "on" + tasktype
    if (target.addEventListener)
        target.addEventListener(tasktype, functionref, false)
    else if (target.attachEvent)
        target.attachEvent(tasktype, functionref)
}