var Compatible;

function fCheckBrowser()
{
 if(document.images)
  {
    Compatible = true;
   }
  else
   {
    Compatible = false;
   }
}

function fPreload(Name)
{
 if(Compatible)
  {
   eval(Name + "_A = new Image;");
   eval(Name + "_A.src = '/images/" + Name + "_A.gif';");                               
   eval(Name + "_B = new Image;");
   eval(Name + "_B.src = '/images/" + Name + "_B.gif';");
                        
  }
}

function fMouseOver(Name)
{
  if(Compatible)
   {
    document[Name].src = eval(Name + "_B.src");
   }
}

function fMouseOut(Name)
{
 if(Compatible)
  {
   document[Name].src = eval(Name + "_A.src");
  }
}
                                
fCheckBrowser();
                                
fPreload('iyrlogo');