I see this weird problem; when I have a link code inside a div which is several level nested I cant click on the link. Also to note that one of the parent div has position:relative; style set.

<div>
<div>
<a href="...">...</a>
</div>
</div>

Setting the z-index for the containing div seem to take care of it.

<div>
<div style="z-index:9999;">
<a href="...">...</a>
</div>
</div>