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

function changeImages() {
	//alert("Arg 1:" + changeImages.arguments[0]);
	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) {
		navi1_over = newImage('images/button_haku_over.gif');
		navi2_over = newImage('images/button_info_over.gif');
		navi3_over = newImage('images/button_mediakortti_over.gif');
		normal_1 = newImage('images/topbar_1.jpg');
		normal_2 = newImage('images/button_haku.gif');
		normal_3 = newImage('images/button_info.gif');
		normal_4 = newImage('images/button_mediakortti.gif');
		normal_5 = newImage('images/box_leftmiddle.gif');
		normal_6 = newImage('images/box_centermiddle_bg.gif');
		normal_7 = newImage('images/box_rightmiddle.gif');
		preloadFlag = true;
	}
}