Error when importing

I have been getting the following error when importing, using the old style import. 

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: http://www.beginnertriathlete.com/discussion/jscripts/scriptaculous... am importing from a Garmin 910XT.  I am using Firefox 11.0.  This use to work but I cannot recall if it has worked since the latest Firefox release.  I have just been clicking Continue and it does actually update my log so not a huge deal