error di query

halo gan ini penyebab nya apa yah? saya pernah coba pake mssql_query tapi gak pernah error kenapa ini error yah?

<?php

    $servername = "SERVER";
    $username = "hpuser";
    $password = "paiho@adminweb";
    $dbname = "phmis";

    // membuat koneksi
    $koneksi = mssql_connect($servername, $username, $password, $dbname);




    if($_POST['rowid']) {
    $id = $_POST['rowid'];
    $sql = ("SELECT * from [cust_pric] where cp_cid='$id'");
    $result = mssql_query($koneksi, $sql); // koneksinya didalam query jgn diluar
    while($row = mssql_fetch_assoc($result) ){
        ?>
            <table class="example">
                <tr>
                    <td>cp_cid</td>
                    <td>:</td>
                    <td><?php echo $row['cp_cid']; ?></td>
                </tr>
                <tr>
                    <td>cp_mate</td>
                    <td>:</td>
                    <td><?php echo $row['cp_mate']; ?></td>
                </tr>
                <tr>
                    <td>cp_hues</td>
                    <td>:</td>
                    <td><?php echo $row['cp_hues']; ?></td>
                </tr>
            </table>
        <?php

        }
    }
    mssql_close($koneksi);
?>