The classic theme? There is no classic theme that comes with CGP 1.5.x.
Do you realize that themes designed for CPG 1.4.x are not compatible with the 1.5.x series? If you are using the "classic" theme from 1.4.x with 1.5.x, this is your problem. Are you positive that you updated properly? Your FTP app may not have overwritten existing folders. Because you do indeed have the required Curve theme, but also have the "Classic" theme (from 1.4.x ?):
http://www.eastgermanshepherdpups.com/gallery/?theme=classichttp://www.eastgermanshepherdpups.com/gallery/?theme=curveYet both display the same extra output. And shouldn't.
The Curve theme has replaced the Classic theme in 1.5.x (if referencing as a default theme, in other words). To actually obtain the ported Classic theme, you must download it separately from
http://forum.coppermine-gallery.net/index.php?board=95.0 I believe Gene-2008 has upgraded the Classic theme and added a few different variations of it to boot.
But even using your Curve theme lights up W3C like a Christmas tree. So it appears your problem lies deeper into CPG than just theme error(s).
You say you are trying to learn this on the fly, but your theme (and perhaps other core files) have been modified. Did you create your (1.4) theme? Or did someone help you? And for the record, have you edited any files other than anycontent.php? Have you made any changes to the core code?
Lastly, regarding breaking up the main page, you can use anycontent.php as a navigation menu to other pages that you wish to display. Move some of the flashing fluff to the main index page or elsewhere. But this is just personal preference... my observation and opinion. And is beyond the scope of this particular discussion and best suited for it's own topic.