Copy the following block of code into the head of the page containing the form whose semi-transparent PNG image you want displayed correctly in IE6. If the image is used in the background of the form, the code can be used as is. However (to be continued...) 

<!--[if IE 6]>
<script type="text/javascript" src="DD_belatedPNG_0.0.8a.js"></script>
<script type="text/javascript">
    DD_belatedPNG.fix('.form-all');
</script>
<![endif]-->