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if (document.images)
{
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  pic1.src="http://thewebcreations.com/Navigation/HomeTabOver.jpg";
  ServicesTabOver= new Image(100,35); 
  pic2.src="http://thewebcreations.com/Navigation/ServicesTabOver.jpg";
  PortfolioTabOver= new Image(100,35); 
  pic3.src="http://thewebcreations.com/Navigation/PortfolioTabOver.jpg";
  ContactTabOver= new Image(100,35); 
  pic4.src="http://thewebcreations.com/Navigation/ContactTabOver.jpg";
}

function over(img_name, img_src)
{
document[img_name].src = img_src;
}
//-->