if (navigator.appVersion.indexOf("2.") != -1)
{
   check = false;
}
if ((navigator.appVersion.indexOf("3.") != -1) && (navigator.appName.indexOf("Explorer") != -1))
{
   check = false;
}
else
{
   image1 = new Image();
   image1.src = "graphics/vp-6575s.gif";
   image1on = new Image();
   image1on.src = "graphics/vp-6575t.gif";
   check = true;
}
function imageon(name)   
{
   document[name].src = eval(name + "on.src");
}
function imageoff(name)  
{
   document[name].src = eval(name + ".src");
}
function on(name)  
{
   if (check == true)
   {
      imageon(name);
   }
}
function off(name)  
{
   if (check == true)
   {
      imageoff(name);
   }
}