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)

}