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<form method='post' action='http:/whatever.com/foo'>
 Address: <input type='text' name='address'>
    ...
 <input type='image' name='whatever' src='url-to-image.jpg' border=0>
</form>

<form name='form_name' method='post' action='http:/whatever.com/foo'>
Address: <input type='text' name='address'>
...
<img src='url-to-image.jpg' onClick='document.form_name.submit()'>
</form>