Yes, the code was created by FP. The .htm files view properly in Firefox & IE. Had no problems until after uploading to server. The site url is:
SDMCU
The external sheet is named master.css, and is located in the css subfolder, and is attached. (My first external, so it's probably a mess, but it does validate using the W3C CSS validator.) It should have a header div, main-nav div, content div, and footer div, all of which should be 760px wide, and centered on page. Thanks for replying
master.css