Not sure if this is your problem, and since I can't do any html here on this forum, it maybe be hard to show you.

However, some of your graphics on your style sheet, are wrong.

background-color: #xxxxxx;
background-image: url(http://people.delphiforums.com/xxx.jpg);

See the closing parenthesis after the jpg, graphic. Yours are missing.

Also, I notice this:

/* Makes buttons pretty */
INPUT.button, BUTTON, OPTION.button, TD.BUTTON {
font-family: Verdana, Arial, Helvetica, Geneva, Swiss, Arial, Helvetica, Geneva, sans-serif;
font-size: 8pt;
font-weight: bold;
cursor: hand;
color: #FFFFFF;
background-color: #; /* All buttons */ input.button,input.b2{ background-color: #5c98fa; background-image: url(https://people.delphiforums.com/Isabella308/test3/animat12.gif); background-repeat: repeat; backg }

It's hard to explain, but you see after the background-color#; You have no color, and you don't have the closing bracket } Which is needed. And the last word backg - not sure what that is. I would also drop /* All buttons */ down to another line. That way you can tell when brackets and such are missing from individual codes.

It appears there are some errors on your style sheet that need to be cleaned up. Most times it's just very small errors, that do the most damage.

I'm not sure if I'm seeing everything, or the right things. But I notice this word

CODE:

Just sitting there. If it is there, either put it inside of /* hidden text */ or remove it. :)

With your forum in Classic mode, I couldn't do anything, but in zeta mode, it works pretty well. I left it in zeta mode.

Thank you!

I did receive your message to me but I'll not have access to a desktop until tomorrow (plus I'm working OT at the moment)
See if you can clean up the errors Dee pointed out. 
If you still need help then I'll hop in.