怎么让图片按钮点击重置

 <style type='text/css'>
button{border:none;background:transparent;cursor:pointer;}
</style>
<form METHOD="POST" name="form" action="SaveguestbooK.asp">
  <input name='test' />
  <button type="submit"><img src="http://bbs.blueidea.com/images/blue/newtopic.gif" alt='提交' /></button>
  <button type="reset"><img src="http://bbs.blueidea.com/images/blue/poll.gif" alt='重置' /></button>
</form>

 

<form METHOD="POST" name="form" action="SaveguestbooK.asp">
<input name='test' />
     <input name="Submit" input type="image" src="images/submit.gif">
     <input  name="reset"  input type="image" src="images/reset.gif" onClick="form.reset();return false;">
</form>