Most browsers such as Firefox and Safari support for transparent PNG images. However, there are still numbers of IE6 users who could not take advantage of PNG image transparency.
After googling this problem, testing and comparing different solutions, I finally found an easy and efficient method.
The first step is adding a JavaScript function within the header of each page of HTML or the PHPTemplate file (in case you are a Drupal magician like me :D ).
<head>
<script type="text/javascript">
// Correctif de l'affichage des images PNG dans IE5.5 et IE6
