I need to add some checkboxes to the contact form. I have added the following code:

<tr>
<td valign=middle class="main">
Delivery <?php echo tep_draw_checkbox_field('options', 'delivery',$checked=false); ?> Take-out <?php echo tep_draw_checkbox_field('options', 'take-out',$checked=false); ?> </td></tr>

When I submit the form, if both checkboxes are selected I only receive an email with the second checkbox selected. What am I missing?