Making a colored background for a link

[rugget]

I was wondering how to make a simple text link have a rollover effect that changes the background behind the text. e.g. this menu http://css.maxdesign.com.au/

[bwh2]

a:hover {
background-color: #FF0000;
}
well, that makes it red, but you get the idea.

[rugget]

thank you