It's time for us to preview a jQuery UI theme before we actually download it. We can get an idea of what a theme in the ThemeRoller gallery will look like when applied to widgets:
Point your web browser to http://jqueryui.com/themeroller/.
Select the Gallery tab in the ThemeRoller section on the right-hand side.
Move your mouse pointer over any theme in the gallery. A visual indicator will be displayed.
Select the theme thumbnail:
We've just selected a theme to preview from the ThemeRoller gallery. You'll notice that all the sample widgets to the right are instantly updated with the new theme. If we wanted to, we could change our theme selection and the sample widgets are once again updated with the theme changes.
You'll notice that once you make a theme selection, the URL in your address bar is now long and ugly. These are the individual theme settings for the chosen theme being passed to the ThemeRoller page with the sample widgets....