Hyperlink Styling Problem

Hi,

I'm making a site with basic CSS-styling,
until now, i didn't have problems,
when i'm on the hyperlink, it's underlined,
and when i have visited the hyperlink, the colour changes.
However, it isn't underlined anymore when i'm on it.

Anyone knows how this comes and how i can solve this problem?

Thanks in advance!

Greets,
Michaël Soetaert

Div vanishes when using IE6, please help.

First of all, I would like to introduce myself. This is my first post here as I'm fairly new to complete CSS layouts. My name is Tim and I'm from the Twin Cities area of Minnesota. I've done a few sites with strictly CSS and never had a problem but this one is driving me nuts. I'm having trouble with my Navigation ul completely vanishing in IE6 at random times. The site I'm referring to is currently live at DigitalTown.com if you would like to check it out. Here is the code.

HTML

         <ul id="topnav">

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