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) {
		onstoves = newImage("images/onstoves.gif");
		onfireplaces = newImage("images/onfireplaces.gif");
		oninserts = newImage("images/oninserts.gif");
		onliners = newImage("images/onliners.gif");
		onrepair = newImage("images/onrepair.gif");
		onrestore = newImage("images/onrestore.gif");
		onmaintain = newImage("images/onmaintain.gif");
		oninspect = newImage("images/oninspect.gif");
		onbells = newImage("images/onbells.gif");
		onknockers = newImage("images/onknockers.gif");
		preloadFlag = true;
	}
}