Webuser Forums: CSS Properties

I am trying to get my head around the attributes of the CSS selector a:hover ??
can this selector have more than one attribute assign to the colour of the text that it changes to when the cursor hovers over a link ??
I am looking at the homepage of web-user, and I thought that all the links when hovered over turned red. I presumed that therefore the attribute for the hover selector when hovered over must be set to change the text to red..
Why is it then that when you hover over reversed out type ( white type ) it changes to yellow ???
how can a selector therefore have more than one attribute set for the colour of type..
hope this makes sense.. as I am a complete novice to this HTML malarkey I am probably missing the obvious..( I hope )
hope someone can explain it in laymans terms
Thanks
M

XP Pro - Intel Celeron 1400MHz - 512MB of RAM - 40 GB HDD - Freeserve BB IE6+OE6.

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