function show(lay)
        {
          if (document.getElementById) {                        // IE 5+, NS 6, O5
             document.getElementById(lay).style.visibility = "visible";
          } else {
             if (document.all) {                                // IE 4+
                document.all[lay].visibility = "visible";
             } else {
                if (document.layers) {                          // Netscape 4
                   document.layers[lay].visibility = "show";
                }
             }
          }
        }

function hide(lay)
        {
          if (document.getElementById) {                        // IE 5+, NS 6, O5
             document.getElementById(lay).style.visibility = "hidden";
          } else {
             if (document.all) {                                // IE 4+
                document.all[lay].visibility = "hidden";
             } else {
                if (document.layers) {                          // Netscape 4
                   document.layers[lay].visibility = "hide";
                }
             }
          }
        }