function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}



function mainmenu(){
$(" #nav ul ").css({display: "none"}); // Opera Fix
$(" #nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).slideDown(0);
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
		});
}


function mainrollover(){
$(".roll").hover(
function() {
curr = $(this).find("img").attr("src");
over = curr.replace(/-off\./, '-on.');
$(this).find("img").attr({ src: over});
},
function() {
$(this).find("img").attr({ src: curr});
}
)

$(".roll").find("img").each(function(i) {
temp = this.src;
pre = temp.replace(/-off\./, '-on.');
preload_image_object = new Image();
preload_image_object.src = pre;
});
}
 
 
 $(document).ready(function(){					
	mainmenu();
	mainrollover();
});
 
<!--

function MM_showHideLayers() { //v9.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) 
  with (document) if (getElementById && ((obj=getElementById(args[i]))!=null)) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'block':(v=='hide')?'none':v; }
    obj.display=v; }
}


function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

var nbRubriques = 6;

function showRub(cible)
{
	var theme = cible.id.substring(3);
	 /*alert (theme);*/
		if(document.getElementById('Rub'+theme).style.display == 'block')
		{
			document.getElementById('Rub'+theme).style.display = 'none';
			//alert (document.getElementById('reponse'+theme).style.display);
		}
		else
		{
			document.getElementById('Rub'+theme).style.display = 'block';
		}
	
	// on ferme les autres onglets
	for(var i = 1; i <= nbRubriques; i++)
	{
		if(i != theme)
		{
			if(document.getElementById('Rub'+i).style.display == 'block')
			{
				document.getElementById('Rub'+i).style.display = 'none';
			}
		}
	}
	
}


function showSSRub(cible)
{
	var theme = cible.id.substring(3);
	 /*alert (theme);*/
		if(document.getElementById('ssRub'+theme).style.display == 'block')
		{
			document.getElementById('ssRub'+theme).style.display = 'none';
			//alert (document.getElementById('reponse'+theme).style.display);
		}
		else
		{
			document.getElementById('ssRub'+theme).style.display = 'block';
		}

}

//-->