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

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

var w = screen.width;

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		preload1 = newImage("http://www.killarad.com/images/hover_menu1.png");
		preload2 = newImage("http://www.killarad.com/images/rad_grid3.png");
		preload3 = newImage("http://www.killarad.com/images/key_points_tab1.gif");
		preload4 = newImage("http://www.killarad.com/images/expanded_tab1.gif");
		preloadFlag = true;
	}
}