Post the data failed in php

I have some trouble during post my data, show 500 internal server error. So, I think it must be unsyncronize between client side and server side. I have check but I dont have any clue.This the following php script:

<input type="text" id="use" name="use">
<input type="password" id="pass" name="pass"></td>
<input type="hidden" name="action" value="logaccept">

if ($("#passlog").valid()){
                                var params = $("#passlog").serialize();
                                $.ajax({
                                         type:"post",
                                         url:"process3.php",
                                         data:params,
                                         cache:false,
                                         async:false,
                                         success: function(data){
                                               //do something
                                                }
                                         });
                                   }

This the server side:

switch(postVar('action')) {
              case 'logaccept' :
                passlog(postVar('use'),postVar('pass'));
                break;
}

function passlog($use,$pass){
        $Use = mysql_real_escape_string($use);
        $Pass= mysql_real_escape_string($pass);

//build query
        $sql = "SELECT Privilege FROM admin WHERE user='".$Use."' AND password='".$Pass."'";
echo $sql;
$data=mysql_query($sql) or die(_ERROR26.": ".mysql_error());
if($data){
                $priv = mysql_fetch_assoc($sql);
}else{
                        echo 0; // If login fails
            开发者_开发知识库            }

?> //show Parse error: syntax error, unexpected $end in /var/www/html/process3.php on line 74

Could you tell me what's wrong with my script?

You have a syntax error in file process3.php - thats why you get the internal server error - that is the first thing you have to correct