var menuCloseTimer 	= 0;
var menuTimeout		= 500;
var ddMenuDiv		= '';
var showClass		= 'dd_shown';
var hideClass		= 'dd_hidden';

function menuOpen(divId){
	menuCancelCloseTime();
	
	if(ddMenuDiv!=''){
		ddMenuDiv.className = hideClass;
	}

	ddMenuDiv = document.getElementById(divId);
	ddMenuDiv.className = showClass;
}

function menuCloseTime(){
	menuCloseTimer = window.setTimeout(menuClose,menuTimeout);
}

function menuClose(){
	if(ddMenuDiv!=''){
		ddMenuDiv.className = hideClass;
	}
}

function menuCancelCloseTime(){
	if(menuCloseTimer>0){
		window.clearTimeout(menuCloseTimer);
		menuCloseTimer = 0;
	}
}