//画像切り替え
function imgOver(imgObj,newImgUrl){

	//拡張
	if(newImgUrl != undefined &&  newImgUrl != ""){
		imgObj.src = newImgUrl;
		return;

	}

	//通常


	$old_path = imgObj.src;

	//変更後画像でないか確認する
	if($old_path.indexOf("_ovr") == -1){

		$new_path = imgObj.src;

		if($old_path.indexOf(".gif") > -1){
			$new_path = $old_path.replace(".gif","_ovr.gif");
		}else if($old_path.indexOf(".jpg") > -1){
			$new_path = $old_path.replace(".jpg","_ovr.jpg");
		}else if($old_path.indexOf(".jpeg") > -1){
			$new_path = $old_path.replace(".jpg","_ovr.jpeg");
		}else if($old_path.indexOf(".png") > -1){
			$new_path = $old_path.replace(".png","_ovr.png");

		}else if($old_path.indexOf(".GIF") > -1){
			$new_path = $old_path.replace(".png","_ovr.GIF");
		}else if($old_path.indexOf(".JPG") > -1){
			$new_path = $old_path.replace(".png","_ovr.JPG");
		}else if($old_path.indexOf(".JPEG") > -1){
			$new_path = $old_path.replace(".png","_ovr.JPEG");
		}else if($old_path.indexOf(".PNG") > -1){
			$new_path = $old_path.replace(".png","_ovr.PNG");
		}

		imgObj.src = $new_path;

	}

}




//戻す
function imgOut(imgObj,newImgUrl){

	//拡張
	if(newImgUrl != undefined &&  newImgUrl != ""){
		imgObj.src = newImgUrl;
		return;
	}


	//通常


	$old_path = imgObj.src;
	imgObj.src = $old_path.replace("_ovr","");

}