CSS <ul> causing linebreak in ie7 only

[Vaupell]

tab mod i got is causing alot of line braeks, but ofcourse only in IE7 browsers
IE6 appears fine, now i dont get it..

been searching high and low about this,,
finally found someone with similar issue

http://www.webmasterworld.com/css/3571286.htm

ul.toc ul { /* bizzo */ }

is the outcome of that thread,,
how ewer i donot understand that line..

code snippet of my tab

<li class="popupmenu">
<a href="javascript://" class="popupctrl navtab">{vb:raw tabname}<img style="float:right; padding-top:2px;" src="images/misc/arrow.png"/></a>
<ul class="popupbody popuphover">
{vb:raw linkdisplay}
</ul></li>

im not sure how to get that into my code, to remove the linebrakes caused by ie7 only.