CSS with if/then browser logic

Question

For browsers < IE7, I want to use a certain style attribute, while for other browsers I\'d like to use another. Can I do this using a single css file, or do I have to do

Answer 1

on the jQuery tip check out this plugin: http://jquery.thewikies.com/browser/

a plugin to do what ghills suggests, this is a nice clean way to go.