// ロールオーバー
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) {
		menu_top_over = newImage("images/menu_top-over.jpg");
		menu_greeting_over = newImage("images/menu_greeting-over.jpg");
		menu_knowledge_html_over = newImage("images/menu_knowledge.html-over.jpg");
		menu_influence_over = newImage("images/menu_influence-over.jpg");
		menu_cell_over = newImage("images/menu_cell-over.jpg");
		menu_checkup_over = newImage("images/menu_checkup-over.jpg");
		menu_flow_over = newImage("images/menu_flow-over.jpg");
		menu_goods_over = newImage("images/menu_goods-over.jpg");
		menu_method_over = newImage("images/menu_method-over.jpg");
		menu_faq_over = newImage("images/menu_faq-over.jpg");
		menu_contact_over = newImage("images/menu_contact-over.jpg");
		preloadFlag = true;
	}
}