browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 

if (browser_name == "Netscape" && browser_version < 2.0)
   {roll = 'false';}
else if (browser_name == "Netscape" && browser_version == 2.0)
   {roll = 'false';}
else if (browser_name == "Netscape" && browser_version >= 3.0)
   {roll = 'true';}
else if (browser_name == "Microsoft Internet Explorer" && browser_version <= 2.0)
   {roll = 'false';}
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0)
   {roll = 'true';}
else if (browser_version >= 4.0) 
   {roll = 'true';}
else
   {roll = 'false';}
function toggle(img,ref)
   {if (roll == 'true')
       {document.images[img].src = ref;}
   }


//end