// globals
var IE = (navigator.appName == "Microsoft Internet Explorer") ? 1 : 0;
var NS = (navigator.appName == "Netscape") ? 1 : 0;
var v=parseInt(navigator.appVersion.substring(0,1));
var cur = 0;
  function preload(file){
    image=new Image();
    image.src="/img/grachev/sys/r"+file+"s.gif";
  }
  
  
  
      if (v>=3)
	  {
    for (i=1; i<=8; i++) preload(i);
	}

 function show (num) 
 {  var src=document.images[num].src;
 var str='http://www.grachev.ru/img/grachev/sys/'+num+'s.gif';
 document.images[num].src='/img/grachev/sys/'+num+'s.gif'; 

  if (src==str)  { cur=num;}
 }
	   
 function hide(num)
{     if  (v>=3 )

{ if (cur==num) {cur=num;} 
else 
	document.images[num].src='/img/grachev/sys/'+num+'.gif';
	}

  }
  
  	   function hideall()
	   { var num; 
	       for (i=1; i<=8; i++) {num="r"+i; hide(num);}
		   
		   }