changing background color on a hover?

[rafiki]

code:.ad_link a:hover { background-color:#3333FF;
color:FFFFFF;
height:15px;
width:14%;
position:fixed;
}

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online example:
www.jamiewest.org.uk/style.html
www.jamiewest.org.uk/style.css

[rafiki]

As you can see I fixed it, the problem was no # on the color: FFFFFF and I got the values the wrong way round.