<!--
 m01=new Image();m01_on=new Image();m01.src="bt/about.gif";m01_on.src ="bt/about1.gif";
 m02=new Image();m02_on=new Image();m02.src="bt/cont.gif";m02_on.src ="bt/cont1.gif";
 m03=new Image();m03_on=new Image();m03.src="bt/port.gif";m03_on.src ="bt/port1.gif";
 m04=new Image();m04_on=new Image();m04.src="bt/web.gif";m04_on.src ="bt/web1.gif";
 function mon(imgName) {
    document.images[imgName].src=eval(imgName + "_on.src");
 }
 function mof(imgName) {
    document.images[imgName].src=eval(imgName + ".src");
 }
 function subf(f) {
    if (f.razdel.selectedIndex !=0) {
      this.document.forms[0].submit();
    }
 }
// -->


browser_name = navigator.appName; 
browser_version = parseFloat(navigator.appVersion); 

if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; } 
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; } 
else { roll = 'false'; } 

function load(location){return image; } 
if (roll == 'true'){ tr=new Image(); tr.src="pic/2.jpg"; } 
function show(where)
{ 
if (roll == 'true'){ stored=where; storedLocation=document.images[where].src; document.images[where].src="img/snow1.gif"; } 
} 

function hide() { if (roll == 'true') document.images[stored].src=storedLocation; }