/* 画像先読み */
	if(document.images){
		var imgCh=new Array();
			imgCh[0] = new Image(),imgCh[0].src="./images/g_navi_btn1_off.gif";
			imgCh[1] = new Image(),imgCh[1].src="./images/g_navi_btn1_on.gif";
			imgCh[2] = new Image(),imgCh[2].src="./images/g_navi_btn2_off.gif";
			imgCh[3] = new Image(),imgCh[3].src="./images/g_navi_btn2_on.gif";
			imgCh[4] = new Image(),imgCh[4].src="./images/g_navi_btn3_off.gif";
			imgCh[5] = new Image(),imgCh[5].src="./images/g_navi_btn3_on.gif";
			imgCh[6] = new Image(),imgCh[6].src="./images/g_navi_btn4_off.gif";
			imgCh[7] = new Image(),imgCh[7].src="./images/g_navi_btn4_on.gif";
			imgCh[8] = new Image(),imgCh[8].src="./images/g_navi_btn5_off.gif";
			imgCh[9] = new Image(),imgCh[9].src="./images/g_navi_btn5_on.gif";
			imgCh[10] = new Image(),imgCh[10].src="./images/g_navi_btn6_off.gif";
			imgCh[11] = new Image(),imgCh[11].src="./images/g_navi_btn6_on.gif";
	}
/* マウスオーバーボタン */
	function chBttn(name,num){
		if(document.images)document.images[name].src = imgCh[num].src;
	}