// -----------------------------------------------------------
		NS4 = (document.layers)? true:false
		IE4 = (document.all)? true:false
		// -----------------------------------------------------------
		function show(id)
			{
			if (NS4) document.layers[id].visibility = "show"
			else if (IE4) document.all[id].style.visibility = "visible"
			}
		
		function hide(id) 
			{
			if (NS4) document.layers[id].visibility = "hide"
			else if (IE4) document.all[id].style.visibility = "hidden"
			}
		// -----------------------------------------------------------
         
         var brow = navigator.appName;
         var ver = navigator.appVersion;
         var rollok = false;
         
         if(ver.indexOf('4')>=0){
                 rollok = true;
         }
         else{ 
                 if(brow.indexOf('Netscape')>=0 && ver.indexOf('3')>=0) rollok = true;
         }
         
         function roll(i,s){
                 if(rollok)
                         document.images[i].src =  s;
         }