var visibleVar="null";
      function init(){

           if (navigator.appName == "Netscape") {

                layerRef="document.layers";
                styleSwitch="";
                visibleVar="show";

           }else{

                layerRef="document.all";
                styleSwitch=".style";
                visibleVar="visible";

           }

      }

      function showHideLayerSwitch(layerName){

           if (eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility == visibleVar')){
           hideLayer(layerName);
           }else{
           showLayer(layerName);
           }

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

           eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"');

      }

      function hideLayer(layerName){

           eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"');
		   

      }