if (document.images) {
   aboutOn = new Image();
   aboutOn.src = "images/header/nav/about_us_on.gif";
   investorOn = new Image();
   investorOn.src = "images/header/nav/investor_on.gif";
   governanceOn = new Image();
   governanceOn.src = "images/header/nav/governance_on.gif";
   productsOn = new Image();
   productsOn.src = "images/header/nav/products_on.gif";
   mediaOn = new Image();
   mediaOn.src = "images/header/nav/media_on.gif";
   
   aboutOff = new Image();
   aboutOff.src = "http://www.mylan.com/images/header/nav/about.gif";
   investorOff = new Image();
   investorOff.src = "images/header/nav/investor.gif";
   governanceOff = new Image();
   governanceOff.src = "images/header/nav/governance.gif";
   productsOff = new Image();
   productsOff.src = "images/header/nav/products.gif";
   mediaOff = new Image();
   mediaOff.src = "images/header/nav/media.gif";
}


function swapImage(imgName,newImage) {
   if (document.images) {
      eval('document.' + imgName + '.src = ' + newImage + '.src');
   }
}