/* イメージプリロード
--------------------------------------------------*/
img = new Array('common/image/hdnav_home_ov.gif','common/image/hdnav_about_ov.gif','common/image/hdnav_kyushu_ov.gif','common/image/hdnav_kyushu_ov.gif','common/image/hdnav_hal_ov.gif','common/image/hdnav_accd_ov.gif','image/btn_back_ov.gif','image/btn_conf_ov.gif','image/btn_contback_ov.gif','image/btn_down_ov.gif','image/btn_play_ov.gif','image/btn_trans_ov.gif','image/btn_vote_ov.gif');
preimg = new Array;
for(i=0; i<img.length; i++){
preimg[i] = new Image();
preimg[i].src =img[i];
}


/* 画像切り替え
--------------------------------------------------*/
//<a href="#" onMouseOver="chgImg(this,'画像名')">
var chgimgSv = 'noData';
function chgImg(thisTag,imgName){
	if(thisTag && imgName){ // ov
		var targetImg = document.images[imgName];
		if(targetImg){
			thisTag.onmouseout = chgImg; // マウスアウト処理
			chgimgSv = imgName;
			targetImg.src = targetImg.src.replace('_of.','_ov.');
		}
	}else{ // of
		var targetImg = document.images[chgimgSv];
		if(targetImg){
			targetImg.src = targetImg.src.replace('_ov.','_of.');
			chgimgSv = 'noData';
		}
	}
}