var SwImg; SwImg = new Array;

ImgPreload('image1', 'images/bt/btn_home.gif', 'images/bt/btn_home2.gif');
ImgPreload('image2', 'images/bt/btn_topic.gif', 'images/bt/btn_topic2.gif');
ImgPreload('image3', 'images/bt/btn_powder.gif', 'images/bt/btn_powder2.gif');
ImgPreload('image4', 'images/bt/btn_data.gif', 'images/bt/btn_data2.gif');
ImgPreload('image5', 'images/bt/btn_buy.gif', 'images/bt/btn_buy2.gif');
ImgPreload('image6', 'images/bt/btn_koe.gif', 'images/bt/btn_koe2.gif');
ImgPreload('image7', 'images/bt/btn_gaiyou.gif', 'images/bt/btn_gaiyou2.gif');
ImgPreload('image8', 'images/bt/btn_cont.gif', 'images/bt/btn_cont2.gif');
ImgPreload('image9', 'images/bt/btn_blog.gif', 'images/bt/btn_blog2.gif');
ImgPreload('image10', 'images/bt/btn_kenkyukai.gif', 'images/bt/btn_kenkyukai2.gif');
ImgPreload('image11', 'images/bt/btn2_p1.gif', 'images/bt/btn2_p1_2.gif');
ImgPreload('image12', 'images/bt/btn2_p2.gif', 'images/bt/btn2_p2_2.gif');
ImgPreload('image13', 'images/bt/btn2_d1.gif', 'images/bt/btn2_d1_2.gif');
ImgPreload('image14', 'images/bt/btn2_d2.gif', 'images/bt/btn2_d2_2.gif');
ImgPreload('image15', 'images/bt/btn2_d3.gif', 'images/bt/btn2_d3_2.gif');
ImgPreload('image16', 'images/bt/btn2_d4.gif', 'images/bt/btn2_d4_2.gif');
ImgPreload('image17', 'images/bt/btn2_d5.gif', 'images/bt/btn2_d5_2.gif');
ImgPreload('image18', 'images/bt/btn2_d6.gif', 'images/bt/btn2_d6_2.gif');
ImgPreload('image19', 'images/bt/btn_sassi.gif', 'images/bt/btn_sassi2.gif');
ImgPreload('image20', 'images/bt/btn_jhp.gif', 'images/bt/btn_jhp2.gif');
ImgPreload('image21', 'images/bt/btn2_d7.gif', 'images/bt/btn2_d7_2.gif');

function ImgPreload() {
	var N = ImgPreload.arguments[0];
	SwImg[N] = new Image();
	SwImg[N][0] = new Image();
	SwImg[N][0].src = ImgPreload.arguments[1];
	SwImg[N][1] = new Image();
	SwImg[N][1].src = ImgPreload.arguments[2];
}

function ImgChenge() {
	var ID = ImgChenge.arguments[0];
	var N  = ImgChenge.arguments[1];
	document.images[ID].src = SwImg[ID][N].src;
}