if (document.images){

img1on = new Image();
img1on.src = "/images/nav_students_roll.gif"
img1off = new Image();
img1off.src = "/images/navigation.gif"

img2on = new Image();
img2on.src = "/images/nav_tutors_roll.gif"
img2off = new Image();
img2off.src = "/images/navigation.gif"

img3on = new Image();
img3on.src = "/images/nav_teachers_roll.gif"
img3off = new Image();
img3off.src = "/images/navigation.gif"

img4on = new Image();
img4on.src = "/images/nav_volunteers_roll2.gif"
img4off = new Image();
img4off.src = "/images/navigation.gif"

img6on = new Image();
img6on.src = "/images/hp_btn_investigator_on.gif"
img6off = new Image();
img6off.src = "/images/hp_btn_investigator_off.gif"

img5on = new Image();
img5on.src = "/images/hp_btn_forums_on.gif"
img5off = new Image();
img5off.src = "/images/hp_btn_forums_off.gif"



img7on = new Image();
img7on.src = "/images/hp_btn_midcareer_on.gif"
img7off = new Image();
img7off.src = "/images/hp_btn_midcareer_off.gif"

img8on = new Image();
img8on.src = "/images/hp_btn_outreach_on.gif";
img8off = new Image();
img8off.src = "/images/hp_btn_outreach_off.gif";

img9on = new Image();
img9on.src = "/images/hp_btn_news_on.gif";
img9off = new Image();
img9off.src = "/images/hp_btn_news_off.gif";

img10on = new Image();
img10on.src = "/images/hp_btn_careers_on.gif";
img10off = new Image();
img10off.src = "/images/hp_btn_careers_off.gif";

img11on = new Image();
img11on.src = "/images/hp_btn_contact_on.gif";
img11off = new Image();
img11off.src = "/images/hp_btn_contact_off.gif";

}


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

		
function popup(what,width,height) {
        msgWindow=window.open(what,"NameofWindow","toolbar=no,directories=no,status=no,scrollbars=yes,resize=no,menubar=no,width=" + width + ",height=" + height)
        if (((navigator.appName=="Netscape") && ((navigator.appVersion).charAt(0) > 2))) {
                msgWindow.focus()
        }
}