There use to be a demonstration on the theme demo which displayed which style class defined to which part of the theme, this was really usefull for creating themes ?
I've not seen such a demo but check here for tools to help creating and editing themes. I use Web Developer with Firefox and Crimson Editor as my main tools.
http://forum.coppermine-gallery.net/index.php?topic=31423.0 (http://forum.coppermine-gallery.net/index.php?topic=31423.0)
It was removed from the package, we suggest you use the browser extensions instead. You can still download (http://prdownloads.sourceforge.net/coppermine/cpg1.4.x_theme_styleguide.zip?download) it if you like though.
nibbler
what do you mean by browser extensions ?
The browser extensions Gizmo has refered to in his previous posting. Did you actually bother to follow the link he posted? Here are deep links for the lazy: Tools recommended by the devs: Web Developer Extension (http://forum.coppermine-gallery.net/index.php?topic=31423.msg145984#msg145984) (Firefox), Tools recommended by the devs: Web Accessibility Toolbar (http://forum.coppermine-gallery.net/index.php?topic=31423.msg145985#msg145985) (IE)