// browser integration

   isNS4 = (document.layers) ? true : false;
   isIE4 = (document.all && !document.getElementById) ? true : false;
   isIE5 = (document.all && document.getElementById) ? true : false;
   isNS6 = (!document.all && document.getElementById) ? true : false;
   
   if (isNS4){
      elm = "layers"
      elmStart = "document.layers[";
      elmEnd= "]";
      styleSwitch="";
      visibleVar="show";
      widthDiv=".clip.width";
      heightDiv=".clip.height";
   }
   else if (isIE4) {
      elm = "all"
      elmStart = "document.all[";
      elmEnd= "]";
      styleSwitch=".style";
      visibleVar="visible";
      widthDiv=".offsetWidth";
      heightDiv=".offsetHeight";
   }
   else if (isIE5 || isNS6) {
      elm = "getElementById"
      elmStart = "document.getElementById(";
      elmEnd= ")";
      styleSwitch=".style";
      visibleVar="visible";
      widthDiv=".offsetWidth";
      heightDiv=".offsetHeight";
   }

// hide/show elements

   function showLayer(layerName){
   
      eval(elmStart+'"'+layerName+'"'+elmEnd+styleSwitch+'.visibility="visible"');
   
   }
   
   function hideLayer(layerName){
   
      eval(elmStart+'"'+layerName+'"'+elmEnd+styleSwitch+'.visibility="hidden"');
   }
   
   function hideAll(){
      
      var layerName;

      layerName="divNav1Amenu";
   
      hideLayer(layerName);

      layerName="divNav1Aon";
   
      hideLayer(layerName);

      layerName="divNav1Bmenu";
   
      hideLayer(layerName);

      layerName="divNav1Bon";
   
      hideLayer(layerName);

      layerName="divNav1Cmenu";

      hideLayer(layerName);

      layerName="divNav1Con";

      hideLayer(layerName);
                     	
      layerName="divNav1Dmenu";

      hideLayer(layerName);
                     	
      layerName="divNav1Don";

      hideLayer(layerName);
                     	
      layerName="divNav1Eon";

      hideLayer(layerName);
                     	
      layerName="divNav1Emenu";

      hideLayer(layerName);
                     	
      layerName="divNav1Fon";

      hideLayer(layerName);
                     	
      layerName="divNav1Fmenu";

      hideLayer(layerName);
                     	
      layerName="divNav1Gon";

      hideLayer(layerName);
                     	
      layerName="divNav1Gmenu";

      hideLayer(layerName);
                     	
      layerName="divNav1Hon";

      hideLayer(layerName);
                     	
      layerName="divNav1Hmenu";

      hideLayer(layerName);
   }