Three methods you could use;
#multimedia { display: none; }
Most common, get it all away
#multimedia { visibility: hidden; }
Not too sure about that one and don't know whether it works in IE
#multimedia { height: 1px; overflow: hidden; }
That would be an awkward way to do it but you'd have to make sure it had no border or background, as not to disturb the layout.
You can use that method to hide the interests section of the details section too, see my journal if that interests anyone
Hope that helps