function init_menu(){
	var liens = $('menu').getElementsByTagName('A');
	for(i=0;i<liens.length;i++){
		Event.observe(liens[i],'mouseover',menu_over);
		Event.observe(liens[i],'mouseout',menu_out);
	}
}

function menu_over(e){
	var ref = (e.target.nodeName!='A')? e.target.up('a').readAttribute('rel') : e.target.readAttribute('rel');
	$('rubrique_name').style.backgroundPosition="0 -"+(ref*34)+"px";
}

function menu_out(e){
	$('rubrique_name').style.backgroundPosition="0 -"+(current*34)+"px";
}

Event.observe(window,'load',init_menu);