If condition is available show button

I'm trying to make a button appear on a broadband checker if the condition of availability is "available". Can view the page at http://dwbmedia.co.uk/checker/

        <table class='content-table table-curved' style='width:80%; margin:0 auto;'>


            <thead>
            <tr>
                <th width='37%'>Product</th>
                <th width='21%'>Availability</th>
                <th width='21%'>Download Speed<br />(Upload Speed)</th>
                <th width='21%'>Order now</th>

            </tr>
            </thead>

             <tr>
                <td>DWB Media 20CN ADSL Max</td>
                <td id='adslMaxAvail' class='centered'></td>
                <td id='adslMaxSpeed' class='centered'></td>
                <td class='centered' >order now</td>
            </tr>