//########image change+preload ########

	var img = new Array();

	img[11] = new Image();
	img[11].src="/images/top/btn_solution.gif";
	img[12] = new Image();
	img[12].src="/images/top/btn_solution_on.gif";

	img[21] = new Image();
	img[21] .src = "/images/top/btn_product.gif";
	img[22] = new Image();
	img[22] .src = "/images/top/btn_product_on.gif";

	img[31] = new Image();
	img[31] .src = "/images/top/btn_case.gif";
	img[32] = new Image();
	img[32] .src = "/images/top/btn_case_on.gif";

	img[41] = new Image();
	img[41] .src="/images/top/btn_news.gif";
	img[42] = new Image();
	img[42] .src="/images/top/btn_news_on.gif";

	img[51] = new Image();
	img[51] .src="/images/top/btn_aboutus.gif";
	img[52] = new Image();
	img[52] .src="/images/top/btn_aboutus_on.gif";

//imagesonoff
	function topswapImg(name,num) {
		document.images[name].src = img[num].src;
	}