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) {
		b1 = newImage("pics/b1o.gif");
		b2 = newImage("pics/b2o.gif");
		b3 = newImage("pics/b3o.gif");
		b4 = newImage("pics/b4o.gif");
		b5 = newImage("pics/b5o.gif");
		preloadFlag = true;
	}
}