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) {
		school_03_over = newImage("images/school_03-over.jpg");
		school_04_over = newImage("images/school_04-over.jpg");
		school_05_over = newImage("images/school_05-over.jpg");
		school_06_over = newImage("images/school_06-over.jpg");
		school_07_over = newImage("images/school_07-over.jpg");
		school_08_over = newImage("images/school_08-over.jpg");
		school_09_over = newImage("images/school_09-over.jpg");
		school_10_over = newImage("images/school_10-over.jpg");
		school_11_over = newImage("images/school_11-over.jpg");
		school_12_over = newImage("images/school_12-over.jpg");
		preloadFlag = true;
	}
}