if (document.images) {
	overon = new Image(); overon.src = "../images/over_on.gif";
	overoff = new Image(); overoff.src = "../images/over.gif";
	syllabuson = new Image(); syllabuson.src = "../images/syllabus_on.gif";
	syllabusoff = new Image(); syllabusoff.src = "../images/syllabus.gif";
	
	week1on = new Image(); week1on.src = "../images/week1_on.gif";
	week1off = new Image(); week1off.src = "../images/week1.gif";
	week2on = new Image(); week2on.src = "../images/week2_on.gif";
	week2off = new Image(); week2off.src = "../images/week2.gif";
	week3on = new Image(); week3on.src = "../images/week3_on.gif";
	week3off = new Image(); week3off.src = "../images/week3.gif";
	week4on = new Image(); week4on.src = "../images/week4_on.gif";
	week4off = new Image(); week4off.src = "../images/week4.gif";
	week5on = new Image(); week5on.src = "../images/week5_on.gif";
	week5off = new Image(); week5off.src = "../images/week5.gif";
	week6on = new Image(); week6on.src = "../images/week6_on.gif";
	week6off = new Image(); week6off.src = "../images/week6.gif";

	}
	
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "on.src");
		}
	}

function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName +"off.src");
		}
	}

function openWindow(url, name, w, h) {
  self.name="opener";
  popupWin = window.open(url, name, 'scrollbars,menubar,resizable,' + 'width=' + w + ',height=' + h);
}