function nav()
   {
   var w = document.myform.mylist.selectedIndex;
   var url_add = document.myform.mylist.options[w].value;
   window.location.href = url_add;
   }
function nav1()
   {
   var w = document.myform1.mylist1.selectedIndex;
   var url_add = document.myform1.mylist1.options[w].value;
   window.location.href = url_add;
   }
function nav2()
   {
   var w = document.myform2.mylist2.selectedIndex;
   var url_add = document.myform2.mylist2.options[w].value;
   window.location.href = url_add;
   }
function nav3()
   {
   var w = document.myform3.mylist3.selectedIndex;
   var url_add = document.myform3.mylist3.options[w].value;
   window.location.href = url_add;
   }