Why do I have two of the same CSS style sheets on my page?

I created my index page using a 3 column layout, and I brought in one of the sample css style sheets.  Now I have 3 css style sheets for my page:
1)  thrcolfxdhdr.css
2)  samplegreenyellow.css (I changed the name of the sample)
3)  level3_3.css
The last two have all the same .header .footer, etc.
When I make a change in #2 it doesn not change anything on the page.
When I make a change in #3, it does make a change.
Do I need both.  Right now I am making every change twice!  Can I delete one?  If so, which one?
Thanks.

To see if you can do without one of the stylesheets, go to the head of your document (not the stylesheet) in Code View.
Find one of the link statements (<link href=...etc.) and 'comment it out'. If your page functions without it, you can safely remove the link from your page. If you lose some styles but not all, you will need to spend a little more time with it.
If your two stylesheets are actually identical, you can remove one with no harm done. Also remove the link and delete the stylesheet itself.
If there are slight differences (you can find them by viewing them both in Code View, Tile Vertically in the Window menu), add the differences to one of the stylesheets and then delete the other.
You might be able to compare the two stylesheets quickly in the CSS Styles Panel (but not with either link commented out) while your html page is open, but you won't see details side-by-side there.
To answer your question (in passing!), the reason you did not see changes in your page when you changed Stylesheet #2 is because Stylesheet #3...called after Stylesheet #2...cancelled out all the changes you had made in Stylesheet #2. Then when you made changes in #3, they were NOT cancelled out by #2 because #3 came AFTER #2 in being called. Precedence is what the Cascade is all about.
Beth
Message was edited by: Zabeth69

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