Error when resizing image using Scissors

On entry to an image edit page, I get:

syntax error
http://www.balletgifts.co.uk/wp-admin/js/common.js?ver=20081210
Line 377

When attempting to resize an image, I get the following message:

scissors is not defined
http://www.balletgifts.co.uk/wp-content/plugins/scissors/js/scissors.js
Line 79

http://wordpress.org/extend/plugins/scissors/