var tree = Array(); //
//**********************************************
function createNode(){
	this.up   = -1;        //chield menu up index
	this.next = Array();   //chield menu next indexes
	this.inf  = "";		   //chield menu name	
	this.obj  = null;      //chield menu object difinition
	this.left_pos = -500;  //chield menu left position
	this.top_pos  = 0;     //chield menu left position	
	this.t    = 0;         //chield menu switch on-off timer
}

//**********************************************
function create_tree(content){
	new_node = Array();
		
	root_node = new createNode();
	new_node[0] = root_node;
	return(new_node); 
}

//**********************************************
function addNode(tree_array){
	node = new createNode();		     //create new node
	tree_array[tree_array.length] = node; //add node into tree
	return(tree_array.length - 1);        //return node index		
}

//**********************************************
function addContent(tree_array, handle, content){
	node = tree_array[handle];            // get tree node
	if (!tree_array[handle]) {		        // check if it exists
		alert("Node index " + handle + " doesn't exist.."); 
		return false;
	}
   node.inf = content;                   //write node content 
	tree_array[handle] = node;            //save changes
	return true;
}

//**********************************************
function linkNext(tree_array, link_to, chield){
	//get parent (link_to) and chield (chield) nodes
	link_node   = tree_array[link_to]; 
	chield_node = tree_array[chield];
	
	//get free node
	free_link = link_node.next.length;
	
	//link nodes 
	link_node.next[free_link] = chield;
	chield_node.up           = link_to;
	
	//save changes
	tree_array[link_to] = link_node; 
	tree_array[chield]  = chield_node;
	return true;
} 

//**********************************************
function getChildNode(tree_array, handle){
	
	node = tree_array[handle];          // get tree node
	if (!tree_array[handle]) {			   // check if it exists
		alert("(getChildNode) : Node index "+handle+" doesn't exist ..."); 
		return false;
	}
	return 	node;						      //return node
}