function changeBgColor(layername, newcolor)
{

   if (!document.getElementById && !document.all) return;

var domref;

   if (document.getElementById)
   {
   domref = document.getElementById(layername).style;
   }
   if (document.all)
   {
   domref = document.all(layername).style;
   }

domref.backgroundColor = newcolor;

}