$(function(){
var openmenu=null;
$("div.mega").addClass("open").slideUp(0);  //prepara per il primo passaggio di mouse
$("#nav>li:has('div.mega')").hoverIntent(
    function(){if(openmenu!=null && openmenu!=this)$("div.mega",openmenu).slideUp(10);$("div.mega",this).slideDown("fast");openmenu=this;},
    function(){$("div.mega",this).slideUp("fast");});
$("#nav>li").hover(function(){$("div.box",this).css({backgroundPosition: "100% -100px"})},function(){$("#nav>li>div.box").css({backgroundPosition: "0 0"})});
//$("#nav>li").hover(function(){$("div.box",this).css({backgroundPosition: "100% -100px"});$("#divhomepage").css({visibility:"hidden"})},function(){$("#nav>li>div.box").css({backgroundPosition: "0 0"});$("#divhomepage").css({visibility:"visible"})});
});