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) {
		abt_over = newImage("images/navi/abt2.gif");
		keh_over = newImage("images/navi/keh2.gif");
		she_over = newImage("images/navi/she2.gif");
		tor_over = newImage("images/navi/tor2.gif");
		tik_over = newImage("images/navi/tik2.gif");
		esh_over = newImage("images/navi/esh2.gif");
		pra_over = newImage("images/navi/pra2.gif");
		pro_over = newImage("images/navi/pro2.gif");
		eve_over = newImage("images/navi/eve2.gif");
		con_over = newImage("images/navi/con2.gif");
		oth_over = newImage("images/navi/oth2.gif");
		hom_over = newImage("images/navi/hom2.gif");
		preloadFlag = true;
	}
}