puzzling ? about CSS link properties

A couple of days ago I asked the list how to have two different link styles.
I figured it out, but now I have a question.  In IE5.5 (my testing browser)
the second set of link properties affect the text following the <./a>
closing tag if I do not put a <.P> before the text.  This happens after a
heading or a horizontal line or if I center some text any where on the page.
One of the list members has been helping me.  She uses IE6 and sees no
problem.

This sample page shows what I am talking about.  Apparently the problem only
shows up in IE5.5 (PC) that I know of.  Can anyone explain?
www.shooterready.com/sample.html

Karin

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