Links are visible through the tagtool box (CSS)

In Garland & FF3/IE7, links (in FF), borders & some graphics & links (in IE) will be visible through the tagtool drop down background. It causes the text of some of the options to be difficult to read. The attached picture shows the bug in Firefox 3.
This should be fixed through a simple change to the default CSS styling of the drop-down box. Adding "z-index: 2" in firebug fixed the issue for me.