Hi,
I have improved Collapsed Topics for Moodle 2.5 with the ability to set the toggle icon position as either left or right. Funding gratefully received by all those who supported its development on Moodle Garage - http://www.moodlegarage.com/projects/collapsed-topics-left-to-right/
You can download it from - https://moodle.org/plugins/pluginversion.php?id=3358
Cheers,
Gareth