if (document.images){

img1on = new Image();
img1on.src = "../images/tutors_nav_students_on.gif"
img1off = new Image();
img1off.src = "../images/nav_tutors_on.gif"

img3on = new Image();
img3on.src = "../images/tutors_nav_teachers_on.gif"
img3off = new Image();
img3off.src = "../images/nav_tutors_on.gif"

img4on = new Image();
img4on.src = "../images/tutors_nav_volunteers_on.gif"
img4off = new Image();
img4off.src = "../images/nav_tutors_on.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()
        }
}