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) {
		id2nd_but0_over = newImage("img/2nd_but0-over.gif");
		id2nd_but1_over = newImage("img/2nd_but1-over.gif");
		id2nd_but2_over = newImage("img/2nd_but2-over.gif");
		id2nd_but3_over = newImage("img/2nd_but3-over.gif");
		id2nd_but4_over = newImage("img/2nd_but4-over.gif");
		id2nd_but5_over = newImage("img/2nd_but5-over.gif");
		id2nd_but6_over = newImage("img/2nd_but6-over.gif");		
		home_ico_over = newImage("img/home-ico-over.gif");		
		preloadFlag = true;
	}
}