var SwImg; SwImg = new Array;

// 画像の先読み ImgPreload('imgタグのid', '通常の画像のパス', 'マウスオーバー時の画像のパス')
ImgPreload('ro1', '/share/images/static/kango/main_bt_01.gif', '/share/images/static/kango/main_bt_01_on.gif');
ImgPreload('ro2', '/share/images/static/kango/main_bt_02.gif', '/share/images/static/kango/main_bt_02_on.gif');
ImgPreload('ro3', '/share/images/static/kango/main_bt_03.gif', '/share/images/static/kango/main_bt_03_on.gif');
ImgPreload('ro4', '/share/images/static/kango/main_bt_04.gif', '/share/images/static/kango/main_bt_04_on.gif');
ImgPreload('ro5', '/share/images/static/kango/mn_bt_01.gif', '/share/images/static/kango/mn_bt_01_on.gif');
ImgPreload('ro6', '/share/images/static/kango/mn_bt_02.gif', '/share/images/static/kango/mn_bt_02_on.gif');
ImgPreload('ro7', '/share/images/static/kango/mn_bt_03.gif', '/share/images/static/kango/mn_bt_03_on.gif');
ImgPreload('ro8', '/share/images/static/kango/mn_bt_join.gif', '/share/images/static/kango/mn_bt_join_on.gif');
ImgPreload('ro9', '/share/images/static/kango/step_bt.gif', '/share/images/static/kango/step_bt_on.gif');
ImgPreload('ro10', '/share/images/static/kango/hd_bt_01.gif', '/share/images/static/kango/hd_bt_01_on.gif');
ImgPreload('ro11', '/share/images/static/kango/hd_bt_02.gif', '/share/images/static/kango/hd_bt_02_on.gif');

/* 画像プリロード */
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];
}

/* ロールオーバー */
function ImgChenge() {
	var ID = ImgChenge.arguments[0];
	var N  = ImgChenge.arguments[1];
	document.images[ID].src = SwImg[ID][N].src;
}