ส่งค่า pwd ที่มีเครื่องหมาย + ผ่าน Ajax ไปให้ php ตรวจสอบ แล้วติดปัญหาครับ

<script src="inc/ajax_request_job.js"></script>
<input type="text" name="txt_request_job_user" id="txt_request_job_user" size="15" maxlength="20">
<input type="password" name="txt_request_job_pwd" id="txt_request_job_pwd" size="15" maxlength="20">

var url = 'ldap_check.php';
var pmeters = "ldap_user="+encodeURI(document.getElementById("txt_request_job_user").value)+"&ldap_pwd="+encodeURI(document.getElementById("txt_request_job_pwd").value)+"&ldap_auth=n";
HttPRequest.open('POST',url,true);
HttPRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
HttPRequest.setRequestHeader("Content-length", pmeters.length);
HttPRequest.setRequestHeader("Connection", "close");
HttPRequest.send(pmeters);

$ldap_user=$_POST["ldap_user"];
$ldap_pwd=$_POST["ldap_pwd"];
$ldap_auth=$_POST["ldap_auth"];
	$ldap_bind=ldap_bind($ldap_con,$ldap_user."@".$ldap_dom,$ldap_pwd) or die("ldap_fail");

else if(HttPRequest.responseText == 'ldap_fail')
{
alert("Wrong username or password");
frm_request_job.txt_request_job_pwd.value="";
frm_request_job.txt_request_job_pwd.focus();
}

$ldap_pwd=urldecode($_POST["ldap_pwd"]);