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) {
		hom_hom_over = newImage("./static/images/hom-hom-over.gif");
		abt_over = newImage("./static/images/abt-over.gif");
		cnf_over = newImage("./static/images/cnf-over.gif");
		emp_over = newImage("./static/images/emp-over.gif");
		sup_over = newImage("./static/images/sup-over.gif");
		org_over = newImage("./static/images/org-over.gif");
		con_over = newImage("./static/images/cnt-over.gif");
		preloadFlag = true;
	}
}