function showhidelyr(lyr,sh) {
 var lyrhandle;
 if (document.layers) {
  // Netscape 4
  lyrhandle = document.layers[0].layers[lyr];
  if (sh == "1") { lyrhandle.visibility = "show"; } else { lyrhandle.visibility = "hide"; }
 }
else if (document.all) {
  // IE4+
  lyrhandle = document.all.tags("div")[lyr];
  if (sh == "1") { lyrhandle.style.visibility = "visible"; } else { lyrhandle.style.visibility = "hidden"; }
 }
else if (document.getElementById) {
  // Netscape 6
  lyrhandle = document.getElementById(lyr);
  if (sh == "1") { lyrhandle.style.visibility = "visible"; } else { lyrhandle.style.visibility = "hidden"; }
 }
}