I have a simple script that collapses a footer when clicked, it works fine in all browsers except FF3 on a Mac where the text jumps to the left and back again. Is there a resolution to this? Beacuse of the page's layout I need to keep the margin as they are.

Construction site:

http://wicomsnew.jerram-clients.co.uk/

Click on 'learn more about Wicoms' just above the footer.