var delai = 400;
var timeout;
var opened;
/**
 * rollover sur un bouton
 */

function rollover(n) {
	if(document.getElementById("sm"+n)){ 
		//arreter timer
		if(timeout) {
			clearTimeout(timeout);
			timeout = 0;
			closeMenu()
		}
		//ouvrir le menu
		document.getElementById("sm"+n).style.display = "block";
		document.getElementById("mn"+n).style.backgroundPosition = "0";
		opened = n;
	}
}

/**
 * fermer le menu
 */
function closeMenu() {
	document.getElementById("sm"+opened).style.display = "none";
	document.getElementById("mn"+opened).style.backgroundPosition = "0 0";
}

//rollover sur un bouton, attendre avant de fermer le menu
function rollout() {
	if(document.getElementById("sm"+opened)){ 
		closeDelay();
	}
}

function closeDelay() {
	if(timeout) {
		clearTimeout(timeout);
		timeout = 0;
	}
	timeout = setTimeout('closeMenu();',delai);
}