Custom display for text field
You can find the CSS class or id by installing firebug in your Firefox installation. It let's you point and click on every area of the page.
If this is not enoug install the Theme Developer module (http://drupal.org/project/devel_themer). It helps you to find the appropriate theme merhods and template files to tweak the output to your needs.


If this is all strange stuff, make yourself familiar with basics about drupal theming. This is a good starting point: http://drupal.org/documentation/theme