if (document.images){

img1off = new Image();
img1off.src = "images/dot.gif"
img1on = new Image();
img1on.src = "images/sp_btn_access_on.gif"

img2on = new Image();
img2on.src = "images/sp_btn_catalog_on.gif"

img3on = new Image();
img3on.src = "images/sp_btn_pubs_on.gif"

img4on = new Image();
img4on.src = "images/sp_btn_preserv_on.gif"

img5on = new Image();
img5on.src = "images/sp_btn_tech_on.gif"

img6on = new Image();
img6on.src = "images/sp_btn_collections_on.gif"
}


function imgSwap(imgName,imgFile)  { 
	if(document.images){ 
        document.images[imgName].src = eval (imgFile + ".src");
		}
		}