Problem with CSS3Pie alpha inheritance in IE8

I have some markup kind of like this

<div class="background">
  <ul>
    <li class="tab">tab</li>
    <li class="tab">tab</li>
    <li class="tab">tab</li>
    <li class="tab">tab</li>
  </ul>
</div>

Using css3pie I have a the background wi开发者_运维百科th an rgba transparency but the alpha from the background is cascading down to the tabs in ie8 only.

Does anyone know how I can stop that inheritance or if there is some configuration in css3pie that I need to do to stop that?

The position needed to be set to position: relative on the tabs