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) {
		b2r_over = newImage("images/b2r-over.gif");
		b3r_over = newImage("images/b3r-over.gif");
		b4r_over = newImage("images/b4r-over.gif");
		b5r_over = newImage("images/b5r-over.gif");
		b6r_over = newImage("images/b6r-over.gif");
		b7r_over = newImage("images/b7r-over.gif");
		q1_over = newImage("images/q1-over.gif");
		q2_over = newImage("images/q2-over.gif");
		q3_over = newImage("images/q3-over.gif");
		q4_over = newImage("images/q4-over.gif");
		q5_over = newImage("images/q5-over.gif");
		q6_over = newImage("images/q6-over.gif");
		q7_over = newImage("images/q7-over.gif");
		preloadFlag = true;
	}
}