function listshow(obj1,obj2,obj3)
{
   document.getElementById("list"+obj1).style.display="";
   document.getElementById("list"+obj2).style.display="none";
   document.getElementById("list"+obj3).style.display="none";
   document.getElementById("img"+obj1).src="/images/qh1_"+obj1+".gif";  
   document.getElementById("img"+obj2).src="/images/qh_"+obj2+".gif";  
   document.getElementById("img"+obj3).src="/images/qh_"+obj3+".gif";  


}