function addCart( num, proId, minNum ){
	if( !CheckInteger( num, "購入数量" ) )	return false;
	if( minNum < 1 ) minNum = 1 ;
	if( num.value < minNum ){
		alert( "この商品の最低購入制限は " + minNum + " 枚" );
		num.focus();
		num.select();
		return false;
	}
	window.location = "cart.php?action=add&id=" + proId + "&num=" + num.value + "&minNum=" + minNum;
}