Border-radius (PIE.htc), Wordpress and IE8

I don't know what I am doing wrong on this one, but I tried incorporating CSS3PIE in Wordpress and it is not working for some reason. Since there are no rounded corners in IE8.

So I inserted this code in header.php:

<!--[if lte IE 8]>
<style type="text/css" media="screen">
   .slides_container, .slides_container div.slide img { 
          behavior: url('<?php bloginfo( 'template_directory' ); ?>/js/PIE/PIE.php'); 
    }
</style>
<![endif]-->

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And this code in .htaccess:

AddType text/x-component .htc

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Then this is the code from PIE.php:

<?php
header( 'Content-type: text/x-component' );
header( 'Content-length: '.filesize('PIE.htc') );
include( 'PIE.htc' );include( 'PIE.htc' );
?>

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Does anyone knows what I am doing wrong?
Click here to see the dev site.

Thanks,

Paul