The CSS file that Neopets uses can be found here:
http://www.neopets.com/css/default.css
In it are all of the possible things you can remove. Find the area you wish to remove and add {display: none;} or {display:none !important;} after it in your external style sheet. It may take some playing around, but you should be able to remove almost anything you wish. (By the way, the following is for IE; I'm not sure what the codes are for FF.)
For instance, I wanted the rotating footer image removed so I added:
Code:
.footerNifty{display:none;}
Navar57, if I understand you correctly, you wish to have the space where the top banner ads were meant to be, but without the ads? To enable the banner space,
remove the following from your external style sheet:
Code:
#ban{display:none !important;}
(And remember to restart your browser for changes to take effect.)
EDIT: Re-reading you as I was still not fully awake when posting before. It is possible that since Premium is ad-free that that banner space might not exist by default. But I don't know since I don't have Premium. The "cut off" look is mainly because of the horizontal top and bottom "bars" now. I suppose we all just have to get used to it. Oh well.