Your task is to create a configuration widget to choose alternative cross hair themes in Marble. The cross hair themes are available from an earlier Code-in task. Similar code for the compass plugin is available to get you started quickly, see http://nienhueser.de/blog/?p=252

The following subtasks need to be done:

• Setup a development environment for Marble, see http://edu.kde.org/marble/obtain.php
• Apply this patch. It implements the configuration dialog for the compass item
• Get the cross hair themes from here
• If needed, use inkscape to resize them to a useful size (around 20x20 pixel)
• Implement a configuration dialog for the cross hair plugin similar to the one for the compass plugin (see patch above)