连接两个字符串时遇到问题

I've been tossing and turning around why on earth this thing won't work. The two strings won't combine and only the $title will be saved. How come? :( even if the account is admin, it won't work. The value of account that will be saved is admin and yet the title wont concatenate. :(

See the code for yourself

    <?php

    $con    = mysql_connect("localhost","root","");
    mysql_select_db("fullcalendar", $con);

    $title  = $_POST['title'];
    $start  = $_POST['start'];
    $end    = $_POST['end'];
    $account= $_POST['account'];
    $sumpay = 'USC' ;

       if($account == "admin")
       {
         $ti= $title.$sumpay;
       }

    // insert the records
    mysql_query("SELECT * FROM evenement");
    mysql_query( "INSERT INTO evenement (id, title, start, end, account) 
        VALUES ('', '$ti', '$start', '$end' , '$account')");
    ?>

try using mysqli...

 //   first check the values posted using
   print_r($_POST);

also make this change...

   if($account == "admin")
     $ti= $title.$sumpay;
   else
     $ti= $title;