Centering Menu

As I construct my Web site, I am finding more and more that I don't
understand: something works, but I can't get the same effects on
subsequent pages. 8<{{
For example, I have the following url:

www.midtownmuseumdistrict.org/index2.html

that works pretty much as I'd like. Of particular note is the menu at
the top that is centered on the page. However, this page:

www.midtownmuseumdistrict.org/Businesses3.html

doesn't align its menu (which has submenues) in the center - and I can't
figure out how to do so. Please advise. TIA

Mike Copeland wrote:

As I construct my Web site, I am finding more and more that I don't
understand: something works, but I can't get the same effects on
subsequent pages. 8<{{
For example, I have the following url:

www.midtownmuseumdistrict.org/index2.html

that works pretty much as I'd like. Of particular note is the menu at
the top that is centered on the page. However, this page:

www.midtownmuseumdistrict.org/Businesses3.html

doesn't align its menu (which has submenues) in the center - and I can't
figure out how to do so. Please advise. TIA

One page is in quirks mode, the other in Strict. They both have HTML
validation errors. They both have CSS errors. In the one which "works"
the menu and title are within the same block; in the other they are not.

Start off by using the same DOCTYPE for both, a DOCTYPE that triggers
standards mode. Then eliminate the HTML and CSS errors. Then fix up
the block inconsistencies.