var IsIE = navigator.appVersion.indexOf("MSIE") >= 0;

var IsNS6up = navigator.userAgent.indexOf("Gecko")>=0;

var IsMac  = navigator.appVersion.indexOf("Mac")>=0;

var isNS4 = (document.layers) ? true: false;

var isDOM = (document.getElementById) ? true: false;

var IsIE4 = IsIE && !isDOM;

var iMenuSeq = 0;



function MS_Tree(id)

{

	this.id = id;

	this.items = new Array();

	this.depth = 0;

	this.addItem = function(aItem){this.items[this.items.length] = aItem;};

}



function MS_TreeItem(id)

{

	this.id = id;

	this.tree = null;

	this.subtree = null;

	this.makeSubtree =  function(aTree){this.subtree = aTree;};

}

function MS_Stack()

{

	this.items = new Array();

	this.length = function(){ return this.index;};

	this.index = 0;

	this.push = function(aItem){this.items[this.index] = aItem;this.index++;};

	this.pop = function(){ var aItem = this.items[this.index-1]; delete this.items[this.index-1] ; this.index--; return aItem;};

	this.toString =  function(){return  this.items.toString();};

}





function MS_Menu(id)

{

	this.id = (id)? id : ("MenuRoot" + iMenuSeq++); 

	this.bgColor = "#003366";

	this.bgColorOver = "#6699CC";



	this.topFontFamily = "Tahoma, Arial";

	this.topFontSize = "9pt";

	this.topFontColor = "white";

	this.topFontWeight = "bold";

	

	this.fontFamily = "Arial,sans-serif";

	this.fontSize = "9pt";

	this.fontColor = "white";

	this.fontColorOver = "white";

	this.borderWidth = "1px";

	this.borderColor = "#6699CC";

	this.itemWidth = 	"150px"; 

	this.itemHeight = 	"20px"; 	

	this.hasMoreHtml = "<img src='/images/tri.gif'>";

	this.htmlBetweenTopItems = "";

	this.offsetLeft = "0px";

	this.offsetTop = "0px";	



	this.menuWidth = 	parseInt(this.borderWidth,10) * 2 + parseInt(this.itemWidth,10);



	this.BEGIN = MS_Menu_Begin;

	this.END = MS_Menu_End;

	this.POPUP = MS_Menu_Popup;

	this.MENUITEM = MS_Menu_Item;



//	this.m_Stack = new Array();

	this.m_Stack = new MS_Stack();



	this.depth = 0;

	this.treeRoot = new MS_Tree(id);

	this.currentTree = this.treeRoot;

	this.currentTreeItem = null;

	this.selectedMenu = null;

	this.selectedMenuItem = null;

	this.selectedLayerByDepth = null;

	this.RENDER = MS_Menu_Draw;

}



function MS_Menu_Begin()

{

	this.m_Stack.push (this.currentTree);	

	if(this.m_Stack.length() >this.depth) this.depth = this.m_Stack.length();

	if(this.currentTreeItem) {

		this.currentTree = this.currentTreeItem.subtree;



	}

}



function MS_Menu_End()

{	this.currentTree.topMenuObj = this;

	this.currentTree = this.m_Stack.pop();

}



function MS_Menu_Popup(id, url, target, offImage, onImage, selectedImage)

{	

	this.currentTreeItem = new MS_TreeItem(id);

	this.currentTreeItem.url = url;

	this.currentTreeItem.target = target;



	this.currentTreeItem.offImage = offImage;

	if(!onImage)  onImage =  offImage; this.currentTreeItem.onImage = onImage;

	if(!selectedImage) selectedImage = onImage; this.currentTreeItem.selectedImage =  selectedImage;



	this.currentTreeItem.subtree = new MS_Tree(id);

	this.currentTreeItem.subtree.depth =  this.m_Stack.length();

	this.currentTreeItem.tree = this.currentTree;

	this.currentTree.addItem(this.currentTreeItem);



}



function MS_Menu_Item(id, url, target, offImage, onImage, selectedImage)

{

	this.currentTreeItem = new MS_TreeItem(id);

	this.currentTreeItem.url = url;

	this.currentTreeItem.target = target;



	this.currentTreeItem.offImage = offImage;

	if(!onImage)  onImage =  offImage; this.currentTreeItem.onImage = onImage;

	if(!selectedImage) selectedImage = onImage; this.currentTreeItem.selectedImage =  selectedImage;



	this.currentTreeItem.tree = this.currentTree;

	this.currentTree.addItem(this.currentTreeItem);

}









if(isNS4){

	document.write("<scri" + "pt language=javascript src=http://www.glass.org/MS_Menu_NS4.js></scr" + "ipt>");

}else if(isDOM){

	document.write("<scri" + "pt language=javascript src=http://www.glass.org/MS_Menu_DOM.js></scr" + "ipt>");

}else if(IsIE4){

	document.write("<scri" + "pt language=javascript src=http://www.glass.org/MS_Menu_IE4.js></scr" + "ipt>");

}