if (document.images) {

        img1on = new Image();
        img1on.src = "/images/hp_btn_props_on.gif";
        img1off = new Image();
        img1off.src = "/images/hp_btn_props.gif"
				
        img2on = new Image();
        img2on.src = "/images/hp_btn_buy_on.gif";
        img2off = new Image();
        img2off.src = "/images/hp_btn_buy.gif"
				
        img3on = new Image();
        img3on.src = "/images/hp_btn_fin_on.gif";
        img3off = new Image();
        img3off.src = "/images/hp_btn_fin.gif"
				
        img4on = new Image();
        img4on.src = "/images/hp_btn_seller_on.gif";
        img4off = new Image();
        img4off.src = "/images/hp_btn_seller.gif"
			
}
function imgSwap (imgName,imgFile)  { 
        if (document.images)  {
                document.images[imgName].src = eval (imgFile + ".src");
        }
}