function ShowHideLayer(szDivID, iState) // 1 visible, 0 hidden
{
   var obj = document.layers ? document.layers[szDivID] :
   document.getElementById ?  document.getElementById(szDivID).style :
   document.all[szDivID].style;
   obj.display = document.layers ? ( iState ? "none" : "block") :
   (iState ? "none" : "block");
}