function mainmenu(){
$(" #nav").css({display: "none"}); // Opera Fix
$(" #annonces").hover(function(){
		$(document).find('#nav').css({visibility: "visible",display: "none"}).show();
		},function(){
		//$(document).find('#nav').css({visibility: "hidden"});
		$(document).find('#nav').hover(function(){
		$(this).css({visibility: "visible"});},function(){
		$(this).css({visibility: "hidden"});});
		});
}

 
 
 $(document).ready(function(){					
	mainmenu();
});