IE7 and IE8 compatibility added, only 2 lines modified, check the code and let me now if it's ok for you... If you accept both pull requests it will be needed to regenerate the minified file, because it doesn't include the not approved pull request.
IE7 and IE8 compatible
Added your changes but I must have messed up on the merge. Your contribution was not reflected! Sorry about that. I'm glad you like the plugin, thanks for your contributions!