var homeon = new Image(85,45);
homeon.src = "imgs/home.gif";
var homeoff = new Image(85,45);
homeoff.src = "imgs/home_o.gif";

var syllabuson = new Image(67,44);
syllabuson.src = "imgs/syllabus.gif";
var syllabusoff = new Image(67,44);
syllabusoff.src = "imgs/syllabus_o.gif";

var finalPaperon = new Image(74,44);
finalPaperon.src = "imgs/finalPaper.gif";
var finalPaperoff = new Image(74,44);
finalPaperoff.src = "imgs/finalPaper_o.gif";

var timelineon = new Image(64,44);
timelineon.src = "imgs/timeline.gif";
var timelineoff = new Image(64,44);
timelineoff.src = "imgs/timeline_o.gif";

var filmson = new Image(54,44);
filmson.src = "imgs/films.gif";
var filmsoff = new Image(54,44);
filmsoff.src = "imgs/films_o.gif";

var slideson = new Image(54,44);
slideson.src = "imgs/slides.gif";
var slidesoff = new Image(54,44);
slidesoff.src = "imgs/slides_o.gif";

var staffon = new Image(48,44);
staffon.src = "imgs/staff.gif";
var staffoff = new Image(48,44);
staffoff.src = "imgs/staff_o.gif";

var resourceson = new Image(76,44);
resourceson.src = "imgs/resources.gif";
var resourcesoff = new Image(76,44);
resourcesoff.src = "imgs/resources_o.gif";

var supplementalon = new Image(182,44);
supplementalon.src = "imgs/supplemental.gif";
var supplementaloff = new Image(182,44);
supplementaloff.src = "imgs/supplemental_o.gif";

function swapImgs(imgName, on)
{
	if(document.getElementById){
		var img = document.getElementById(imgName);
		on  ? img.src = eval(imgName+"on.src") : img.src = eval(imgName+"off.src"); 
	}

}