function changeImagesOff(imageName) {
	  document[imageName].src = 'images/' + imageName + '.gif';
}

function changeImagesOn(imageName) {
	  document[imageName].src = 'images/' + imageName + 'On.gif';
}

function preloadImages() {
	loadImage("images/headerTopOn.gif");
	loadImage("images/tabCandidatesOn.gif");
	loadImage("images/tabEmployersOn.gif");
	loadImage("images/tabJobListingsOn.gif");
	loadImage("images/tabCareerResourcesOn.gif");
	loadImage("images/tabContactUsOn.gif");

	return true;
}

function loadImage(src) {
	var tempImage = new Image();
	tempImage.src = src;
}