Trouble submitting a form using a image type button? Use hidden field

Trouble submitting a form using a image type button?
Image type button sometimes not work with POST method in IE,
Easiest way to overcome this is to set a hidden field and check that in your php code

<?php

if(isset($_POST['sub']))
{
  //do somthing
}
?>

<form name="form1" method="POST" action="">
<input type="image" src"..." />
<input type="hidden" name="sub" value="sub" />
</form>

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