Theme development

Hello,

In anouther thread NoFear wrote:

You should really avoid to edit drupal core such as user.module, because if a security update gets published, you'll have to go through all the files and find the changes you've made and make them in the updated files again...

P.S: There's other ways to change the value of the Log in Button, if you don't want to be a naughty boy...
:-)

What are the other ways?

For anyone who starts developing a new Drupal theme it would be very usefull to preview existing themes.

The themegarden.org is dual Drupal 4.7 and Drupal 5 powered site, where you can preview Drupal themes on live Drupal engines. All themes are shown as is.

themegarden.org

Is it possible to have an option within a user's profile to be able to add an unlimited amount of data and have that data be attached to taxonomy terms for creating lists?

Example: I want my users to save all the tools they own in their profile. Since each user can have 1 - n tools, I want them to be able to define their own list. When they add each tool, it will have a define set of attributes per tool such as the type, color, and availability.

I'm currently working on setting up http://drupal.earthlytents.com/ and I would like to make the main content area (with the white background) have rounded corners.

I looked at this technique for setting up rounded corners, but I couldn't figure out how to fit it to this solution.

What would be the best solution for this if considering I might want to change this to an expandable layout?

I'm setting up a site based on the Zen theme and am having several problems with getting my cross-browser css right. The site is http://drupal.earthlytents.com/

I would like to have a different image at the top of the site for dfferent sections of the site.
For example:
http://www.campushope.com/ the image at the top that says welcome, should be different if you are under the http://www.campushope.com/News News page.

any pointers would be really appreciated. :)