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

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

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.style.visibility = "visible"
    //        }
    //        else {
    //            ulelement.setAttribute("rel", "closed")
    //            ulelement.style.display = "none"
    //            ulelement.style.visibility = "hidden"
    //        }
    //} //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
    //    {
    //        alert("close")
    //        ulelement.setAttribute("rel", "closed")
    //        ulelement.style.display = "none"
    //        ulelement.style.visibility = "hidden"
    //    }
    //    else if (ulelement.getAttribute("rel") == "open") //else if no cookie and this UL has an explicit rel value of "open"
    //    {
    //        alert("close1")
    //        ddtreemenu.expandSubTree(treeid, ulelement) //expand this UL plus all parent ULs (so the most inner UL is revealed!)
    //    }


        function Collapsetree(idTree) {
        var ultags = document.getElementById(idTree).getElementsByTagName("ul");
        for (var i = 0; i < ultags.length; i++) {
            ultags[i].style.display = "none"
            ultags[i].style.visibility = "hidden"
            ultags[i].setAttribute("rel", "closed")
        }
    }

    ulelement.parentNode.onclick = function(e) {
        //alert("click");
        var ultags = document.getElementById(treeid).getElementsByTagName("ul");
        var submenu = this.getElementsByTagName("ul")[0]
        for (var i = 0; i < ultags.length; i++) {
            if (ultags[i].id != this.getElementsByTagName("ul")[0].id) {
                //alert("close1");
                ultags[i].style.display = "none"
                ultags[i].style.visibility = "hidden"
                ultags[i].setAttribute("rel", "closed")
            }
        }
        //alert(submenu.getAttribute("rel"));
        if (submenu.getAttribute("rel") == "closed") {
            //alert("open");
            submenu.style.display = "block"
            submenu.style.visibility = "visible"
            submenu.setAttribute("rel", "open")
            ulelement.parentNode.style.backgroundImage = "url(" + ddtreemenu.openfolder + ")"
        }
        else if (submenu.getAttribute("rel") == "open") {
            //alert("close2");
            submenu.style.display = "none"
            submenu.style.visibility = "hidden"
            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) {
    var rootnode = document.getElementById(treeid)
    var currentnode = ulelement
    currentnode.style.display = "block"
    currentnode.style.visibility = "visible"
    currentnode.parentNode.style.backgroundImage = "url(" + ddtreemenu.openfolder + ")"
    while (currentnode != rootnode) {
        if (currentnode.tagName == "UL") {
            currentnode.style.display = "block"
            currentnode.style.visibility = "visible"
            currentnode.setAttribute("rel", "open")
            currentnode.parentNode.style.backgroundImage = "url(" + ddtreemenu.openfolder + ")"
        }
        currentnode = currentnode.parentNode
    }
}

ddtreemenu.flatten = function(treeid, action) {
    var ultags = document.getElementById(treeid).getElementsByTagName("ul")
    for (var i = 0; i < ultags.length; i++) {
        ultags[i].style.display = (action == "expand") ? "block" : "none"
        ultags[i].style.visibility = (action == "expand") ? "visible" : "hidden"
        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) {
    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) {
        openuls[0] = "none open"
    }
    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)
}