function nascondi_adv()
{
       id = "richmediaquizzi";
       var obj = "";
       if(document.getElementById) {
           obj = document.getElementById(id).style;
		   obj.display = "none";
		   }
       else if(document.all) {
           obj = document.all[id];
		   obj.display = "none";
		   }
       else if(document.layers) {
           obj = document.layers[id];
		   obj.display = "none";
		   }
       else
           return 1;
       
	   
}