if (document.images) {
                nav0On = new Image();
                nav0On.src = "images/nav/homovr.gif";
                nav1On = new Image();
                nav1On.src = "images/nav/bioovr.gif";
                nav2On = new Image();
                nav2On.src = "images/nav/schovr.gif";
                nav3On = new Image();
                nav3On.src = "images/nav/stuovr.gif";
                nav4On = new Image();
                nav4On.src = "images/nav/audovr.gif";
                nav5On = new Image();
                nav5On.src = "images/nav/linovr.gif";
                nav6On = new Image();
                nav6On.src = "images/nav/conovr.gif";
                nav7On = new Image();
                nav7On.src = "images/nav/galovr.gif";
                nav8On = new Image();
                nav8On.src = "images/nav/nutovr.gif";
                nav9On = new Image();
                nav9On.src = "images/nav/resovr.gif";
                nav10On = new Image();
                nav10On.src = "images/nav/pressovr.gif";
                nav11On = new Image();
                nav11On.src = "images/nav/pgdovr.gif";
                nav0Off = new Image();
                nav0Off.src = "images/nav/homoff.gif";
                nav1Off = new Image();
                nav1Off.src = "images/nav/biooff.gif";
                nav2Off = new Image();
                nav2Off.src = "images/nav/schoff.gif";
                nav3Off = new Image();
                nav3Off.src = "images/nav/stuoff.gif";
                nav4Off = new Image();
                nav4Off.src = "images/nav/audoff.gif";
                nav5Off = new Image();
                nav5Off.src = "images/nav/linoff.gif";
                nav6Off = new Image();
                nav6Off.src = "images/nav/conoff.gif";
                nav7Off = new Image();
                nav7Off.src = "images/nav/galoff.gif";
                nav8Off = new Image();
                nav8Off.src = "images/nav/nutoff.gif";
                nav9Off = new Image();
                nav9Off.src = "images/nav/resoff.gif";
                nav10Off = new Image();
                nav10Off.src = "images/nav/pressoff.gif";
                nav11Off = new Image();
                nav11Off.src = "images/nav/pgdoff.gif";                           }
                
        function hiLite(imgDocID,imgObjName) {
        if (document.images) 
                        document.images[imgDocID].src = eval(imgObjName + ".src")
                }