var layerRef="",layerStyleRef="",styleSwitch="";
        
        function init(){
        if (navigator.appName == "Netscape") {
                layerStyleRef="layer.";
                layerRef="document.layers";
                styleSwitch="";
        }else{
                layerStyleRef="layer.style.";
                layerRef="document.all";
                styleSwitch=".style";
          }
        }
                  
        

        function showLayer(layerName){
                eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"');
        }
        
        function hideLayer(layerName){
                eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"');
        }