Código HTML:
<p class="boxinput" style=" float: left; height: 38px; margin-bottom: 10px; margin-left: 36px; margin-top: -0.5%; width: 95%;"><input name="submit" type="submit" value="" onclick="" style="background-image: url(<?php echo $vars['url']; ?>_graphics/enviar.gif); width: 111px; height: 38px; cursor: pointer; ; border-radius: 11px 11px 11px 11px;" /></p>