display: inline;

http://scarfoo.com/archives/16

This one has saved me a lot of headaches, because IE 6 has a tendency to double the margins of every element, which has been floated and assigned a left/right margin. To overcome this bug, simply set display: inline on the offending element. This will magically make the bug disappear with no adverse effects on your layout.

Get rid of double margin in IE

CSS