function Enable(id) {
   obj=document.getElementById(id);
   visible=(obj.style.display!="none")
   if (visible) {
     obj.style.display="none";
   } else {
     obj.style.display="";
   }
}

function Disable(id) {
   obj=document.getElementById(id);
   visible=(obj.style.display!="")
   if (visible) {
     obj.style.display="";
   } else {
     obj.style.display="none";
   }
}