How do I click on the button in the below HTML in capserjs please? The button seems to have no id or any attribute that casperjs supports? Thanks.

<form id="bottomNavigationButtonsFormID" name="bottomNavigationButtonsForm" action="/ucc/searchHome.action" method="post">
                         <table width="100%">
                             <tbody><tr width="100%">
                                 <td width="40%" style="text-align:right">
                                     <button type="button" onclick="window.history.go(-1);">Back</button>
                                 </td>
                                 <td width="60%" style="text-align:left">
                                     <button type="button" onclick="this.form.submit();">Search</button>
                                 </td>
                             </tr>
                         </tbody></table>
                         <input type="hidden" id="navigationButtonFormBasicCSRFTokenID" name="CSRFToken" value="aCrjOHDTNAJzuUsgAOYf7GUxEZdTiXSzi-_XyKj5Gzs">
                     </form>