I'd like to have the width of my table 100% of screen width - so flexible to different screen sizes.

is it possible to have my columns automatically resize proportionately?

I've tried give the td's percentage widths but this doesnt seem to work, firebug shows that the tbody isnt filling the tables width?

        <table class="">
            <tr class="headings">
                <td class="entry">
                </td>
                <td class="calendar">Availability Calendar
                </td>
                <td class="deals">Last Minute Deals
                </td>

                <td class="ann">Announcements
                </td>
                <td class="banners">Banners
                </td>
            </tr>


        </table>