Try validating your code. There's a bunch of errors.
http://validator.w3.org/check?uri=ht...ically%29&ss=1
The top navigation menu is stacked vertically when viewed in Opera.
The whole page is screwed up in Netscape 4.7 and earlier (you need to use an absolute paths for background images in your style sheet to accomodate these browsers).
Try fixing the following errors and the page should work:
http://www.BeyondEight.com/_css/others.css
Line: 0 Context : ul.Links
Invalid number : margin-leftonly 0 can be a length. You must put an unit after your number : 10
Line: 0 Context : ul.Links
Invalid number : padding-leftonly 0 can be a length. You must put an unit after your number : 10
Line: 0 Context : ul.links_white
Invalid number : margin-leftonly 0 can be a length. You must put an unit after your number : 10
Line: 0 Context : ul.links_white
Invalid number : padding-leftonly 0 can be a length. You must put an unit after your number : 10
http://www.BeyondEight.com/_css/workout.css
Line: 0 Context : div.sunday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.monday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.tuesday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.wednesday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.thursday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.friday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em
Line: 0 Context : div.saturday
Invalid number : heightonly 0 can be a length. You must put an unit after your number : 1.5 em