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) {
		hp_05_hp_10_over = newImage("images/hp_05-hp_10_over.jpg");
		hp_06_over = newImage("images/hp_06-over.jpg");
		hp_07_hp_05_over = newImage("images/hp_07-hp_05_over.gif");
		hp_07_hp_10_over = newImage("images/hp_07-hp_10_over.gif");
		hp_07_hp_13_over = newImage("images/hp_07-hp_13_over.gif");
		hp_07_hp_17_over = newImage("images/hp_07-hp_17_over.gif");
		hp_07_hp_19_over = newImage("images/hp_07-hp_19_over.gif");
		hp_08_over = newImage("images/hp_08-over.jpg");
		hp_09_over = newImage("images/hp_09-over.jpg");
		hp_10_over = newImage("images/hp_10-over.jpg");
		hp_11_over = newImage("images/hp_11-over.jpg");
		hp_12_over = newImage("images/hp_12-over.jpg");
		hp_14_over = newImage("images/hp_14-over.jpg");
		hp_15_over = newImage("images/hp_15-over.jpg");
		preloadFlag = true;
	}
}