if (document.images) 
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   img3 = new Image();
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   img6 = new Image();
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   img13.src = "layouts/53/graphics/tier4_1938.gif";
   img14.src = "layouts/53/graphics/tier4_1978.gif";
   img15.src = "layouts/53/graphics/tier4_1986.gif";
   img16.src = "layouts/53/graphics/tier4_1991.gif";
   img17.src = "layouts/53/graphics/tier4_1996.gif";
   img18.src = "layouts/53/graphics/tier4_1999.gif";
   img19.src = "layouts/53/graphics/tier4_2002.gif";
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}