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) {
		image0 = newImage("home_bg_00.jpg");
		image1 = newImage("home_bg_02.jpg");
		image2 = newImage("engineering_home_bg_00.jpg");
		image3 = newImage("engineering_home_bg_01.jpg");
		image4 = newImage("img/headerbg_00.jpg");
		image5 = newImage("img/headerbg_01.jpg");
		who_over = newImage("img/menu_who_over.gif");
		why_over = newImage("img/menu_why_over.gif");
		references_over = newImage("img/menu_references_over.gif");
		where_over = newImage("img/menu_where_over.gif");
		menu_engineering_over = newImage("img/menu_engineering_over.gif");
		menu_recruiting_over = newImage("img/menu_recruiting_over.gif");
		menu_embedded_over = newImage("img/menu_embedded_over.gif");
		menu_test_and_auto_over = newImage("img/menu_test_and_auto_over.gif");
		menu_app_dev_over = newImage("img/menu_app_dev_over.gif");
		menu_test_over = newImage("img/menu_test_over.gif");
		menu_additional_over = newImage("img/menu_additional_over.gif");
		menu_contactus_over = newImage("img/menu_contactus_over.gif");
		preloadFlag = true;
	}
}