var timer	= 0;
var layer	= 0;
var layer_parent=0;


function menu_expand(item_id)
{	
	keep_current_expansion();
	if(layer!=0) 
	{
		layer_parent.style.backgroundImage="url('')";
		layer.style.visibility = 'hidden';
	}
	layer_parent_id=item_id+'M';
	layer_parent = document.getElementById(layer_parent_id);
	layer = document.getElementById(item_id);
	layer_parent.style.backgroundImage="url('imgs/menu_selected_bg.png')";
	layer.style.visibility = 'visible';
}


function menu_timed_collapse()
{
	timer = window.setTimeout(menu_collapse,300);
}

function menu_collapse()
{
	if(layer!=0) 
	{
		layer_parent.style.backgroundImage="url('')";
		layer.style.visibility = 'hidden';
	}
}

function keep_current_expansion()
{
	if(timer!=0)
	{
		window.clearTimeout(timer);
		timer = null;
	}
}

function menu_expand2(item_id)
{	
	keep_current_expansion();
	if(layer!=0) 
	{	
		layer_parent.style.backgroundImage="url('')";
		layer.style.visibility = 'hidden';
	}
	layer_parent_id=item_id+'M';
	layer_parent = document.getElementById(layer_parent_id);
	layer_parent.style.backgroundImage="url('imgs/menu_selected_bg.png')";
}

function menu_collapse2()
{
	layer_parent.style.backgroundImage="url('')";
}