로그인시 캡챠 관련

<?if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가if ($g4['https_url']) {    $outlogin_url = $_GET['url'];    if ($outlogin_url) {        if (preg_match("/^\.\.\//", $outlogin_url)) {            $outlogin_url = urlencode($g4[url]."/".preg_replace("/^\.\.\//", "", $outlogin_url));        }        else {            $purl = parse_url($g4[url]);            if ($purl[path]) {                $path = urlencode($purl[path]);                $urlencode = preg_replace("/".$path."/", "", $urlencode);            }            $outlogin_url = $g4[url].$urlencode;        }    }    else {        $outlogin_url = $g4[url];    }}else {    $outlogin_url = $urlencode;}?><link rel="stylesheet" href="../css/member.css?v=20160606" type="text/css"><script type="text/javascript" src="../js/capslock.js"></script><div id="index">	<header class='header'></header>	<form name="flogin" method="post" onsubmit="return flogin_submit(this);" autocomplete="off">	<input type="hidden" name="url" value='%2Fcontent%2Fmain.php'>	<div class="loginbg">		<div class="loginbox">			<h2>Login</h2>			<table border='0' cellpadding='0' cellspacing='0' width='100%'>				<col width='100' /><col />				<tr>					<th>Id</th>					<td><INPUT type=text maxLength=20 size=15 name=mb_id id="mb_id" minlength="2" class="input-text" tabindex='1'></td>				</tr>				<tr>					<th>Password</th>					<td><INPUT type=password maxLength=20 size=15 name=mb_password id="login_mb_password" itemname="패스워드" required onkeypress="check_capslock(event, 'login_mb_password');" class="input-password" tabindex='2'  /></td>				</tr>				<tr>					<th></th>					<td><input type="submit" value="Login" class='wl-button' tabindex='4' id="login-btn" /></td>				</tr>			</table>			<table border='0' cellpadding='5' cellspacing='0' style='margin-top:30px;'>					<col width='100' /><col />					<tr>						<th>자동등록방지</th>						<td>왼쪽 글자를 입력하세요.</th>					</tr>					<tr valign='top'>						<th><img id='kcaptcha_image' border='0' width='80' height="28" onclick="imageClick();" style="float:left; cursor:pointer;" title="글자가 잘안보이는 경우 클릭하시면 새로운 글자가 나옵니다." /></th>						<td>							<input type=text class=input-text maxLength=8 size=8 name=wr_key itemname="자동등록방지" required style='ime-mode:inactive;' tabindex='3'>						</td>					</tr>				</table>			</div>		</div>	</form>	<footer class='footer'></footer></div><script type="text/javascript"> var md5_norobot_key = ''; </script><script type="text/javascript" src="../js/prototype.js"></script><script type="text/javascript" src="../js/md5.js"></script><script language='Javascript'>function imageClick() {    var url = "./bbs/kcaptcha_session.php";    var para = "";    var myAjax = new Ajax.Request(        url,         {            method: 'post',             asynchronous: true,            parameters: para,             onComplete: imageClickResult        });}function imageClickResult(req) {    var result = req.responseText;    var img = document.createElement("IMG");    img.setAttribute("src", "./bbs/kcaptcha_image.php?t=" + (new Date).getTime());    document.getElementById('kcaptcha_image').src = img.getAttribute('src');    md5_norobot_key = result;}Event.observe(window, "load", imageClick);document.flogin.mb_id.focus();function flogin_submit(f){	if (typeof(f.wr_key) != 'undefined') {        if (hex_md5(f.wr_key.value) != md5_norobot_key) {            alert('자동등록방지용 코드가 맞지 않습니다.');            f.wr_key.activate();            return false;        }    }    f.action = './bbs/login_check.php';    return true;}</script> <!-- 로그인 전 외부로그인 끝 -->