normal html button:

<input type="button" value="Our website" title="Go to sitepoint.com" onclick="location.href='http://sitepoint.com/'" />

imitation button link:

<table cellspacing="0" cellpadding="0">
   <tr>
      <td align="center" style="border: 1px solid #013D74; border-radius: 5px; display: block;">
         <a href="http://sitepoint.com/" title="Go to sitepoint.com" style="padding: 0 10px;
         border: 1px solid #F8B331; border-radius: 4px; background: #F3F3EF; color: #000000;
         font-family: Arial, Helvetica, sans-serif; font-size: .83em; line-height: 1.5em;
         text-decoration: none; display:inline-block">Our website</a>
      </td>
   </tr>
</table>