var ddmenu = 0;
var timer = 0;

function closeMenu(){
ddmenu.style.display = "none";

}

function cancelClose(){
window.clearTimeout(timer);
}

function openMenu(id){

cancelClose();

if(ddmenu) ddmenu.style.display = "none";
ddmenu = document.getElementById(id);

ddmenu.style.display = "block";
}

function closeTimer() {
timer = window.setTimeout( "closeMenu();" , 500);
}