PHP, how do I get this to work

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PHP

<td>
        <h4>To view discounts, simply select from a category below.</h4><br />
        <!-- List Category Box -->

        <?php
        $db = new mysqli('50.62.209.81:3306','user','password','MassWarVetsADM');
        $query="SELECT Category FROM Category";
        $result = mysql_query ($query);
        echo "<select name='categoriesSelect' class='e1'><option value='0'>Please Select A Category</option>";

        // printing the list box select command
        while($categoryinfo=mysql_fetch_array($result)){//Array or records stored in $nt
        echo "<option value=\"".htmlspecialchars($categoryinfo['category'])."\">".$categoryinfo['category']."</option>";
        }
        echo"</select>";
        ?>

When I look at my page in firefox I get this: http://i62.tinypic.com/2eqc22v.png[^]

I removed the username&pw for security reasons. What am I doing wrong?

This should print the business categories listed in the "Category" column within the "Category" table inside the "MassWarVetsADM" database inside a select box. There is about 30 categories.