var ns4 = (document.layers)? true:false;
   var ie4 = (document.all)? true:false;
   var ns6 = (document.getElementById && !document.all)? true:false;

   function show(id) // Show a DIV
   {
 	if (ns4) {document.layers[id].display = "block";}
	else if (ie4) {document.all[id].style.display = "block";}
   	else if (ns6) {document.getElementById(id).style.display = "block";}
   }

   function hide(id) // Hide a DIV
   {
 	if (ns4) {document.layers[id].display  = "none";}
	else if (ie4) {document.all[id].style.display = "none";}
   	else if (ns6) {document.getElementById(id).style.display = "none";}
   }