function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		b_home_01_over = newImage("images/b_home_01-over.gif");
		b_about_01_over = newImage("images/b_about_01-over.gif");
		b_academics_01_over = newImage("images/b_academics_01-over.gif");
		b_teachers_01_over = newImage("images/b_teachers_01-over.gif");
		b_robotics_over = newImage("images/b_robotics_01-over.gif");
		b_sponsors_over = newImage("images/b_sponsors_01-over.gif");
		b_future_01_over = newImage("images/b_future_01-over.gif");		
		preloadFlag = true;
	}
}