function list(n)
{
var i=1;
var flag=true;
do
{  if (i==3)
     {
	 flag=false;
	 }
  var names="a"+i;
  if (i!=n)
  {
  eval(names).style.visibility="hidden";
  }
if(i==n)
	{

eval(names).style.visibility="visible";
    }
i++;
}
while(flag)
}
<!-- Begin
function formHandler()
{
var URL = document.form2.wzfl.options[document.form2.wzfl.selectedIndex].value;
//window.location.href = URL;
window.open(URL);
// End -->
}