Z-index in Internet Explorer not working
It looks like you might be dealing with a known bug:
“In Internet Explorer positioned elements generate a new stacking context, starting with a z-index value of 0. Therefore z-index doesn’t work correctly.”
You can see the bug report on Quirksmode website and a workaround explained in this blog post.
Essentially what you have to do is wrap it in an element with higher Z-index, for example Here is a quick sketch of a workaround:
<div style="position: relative; z-index: 3000">
<div style="position:absolute;z-index:1000;">
...
</div>
</div>