imgFlg = "1";

function imgPreload() {

	//●画像種類入力（半角）
	var type = "GIF";

	//●画像用ディレクトリ名入力
	var dir = "img/over/menu/";

	//●画像名入力
	imageName = new Array("form", "policy", "link","nougyou","jyoukyou","soudan","otetsudai","jyuku","qa","voice","oideyo","mail");
	
	imageFileName = new Array;
	for (var i=0; i < imageName.length; i++) {
		imageFileName[imageName[i]] = new Array;
		for (var i2=0; i2 < 2; i2++) {
			imageFileName[imageName[i]][i2] = new Image;
			imageFileName[imageName[i]][i2] = dir + "/" + imageName[i] + i2 + "." + type.toLowerCase();
		}
	}
}

imgPreload();

function changeImage(obj) {
	var url = obj.src;
	var sep = url.split("/");
	var fName = sep[sep.length - 1];
	var sep_fName = fName.split(".");
	var key = fName.substring(0, sep_fName[0].length - 1);

//	alert(key);

	obj.src = imageFileName[key][imgFlg];
	if (imgFlg == "1") {
		imgFlg = "0";
	} else {
		imgFlg = "1";
	}
}