sfHover = function() {
        var sfEls = document.getElementById("menuDeroulant").getElementsByTagName("LI");
        for (var i=0; i<sfEls.length; i++) {
                sfEls[i].onmouseover=function() {
                        this.className+=" sfhover";
                }
                sfEls[i].onmouseout=function() {
                        this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
                }
        }
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

var obj = null;

function checkHover() {
	if (obj) {
		obj.find('ul').fadeOut('fast');	
	} //if
} //checkHover

$(document).ready(function() {
	$('#Nav > li').hover(function() {
		if (obj) {
			obj.find('ul').slideUp('fast');
			obj = null;
		} //if
		
		$(this).find('ul').slideDown('fast');
	}, function() {
		obj = $(this);
		setTimeout("checkHover()", 0); // si vous souhaitez retarder la disparition, c'est ici
	});
});