Well, I'm trying to use transparent .png as background of my header etc...

I found a js called DD_belatedPNG.js. Some guys told me it`s great for transparent thing for ie 6...

And i uploaded it with my zencart... but i don't know where i need to add the code...
Code:
<!--[if lte IE 6]>
<script src="DD_belatedPNG_0.0.7a.js" type="text/javascript"></script>
      <script type="text/javascript">
        DD_belatedPNG.fix('#divheaderblabla');
      </script>
      <![endif]-->
I don't really understand php so I think I'm lost o.O