To use the script, users have to visit the Fan page in question and click on Suggest to Friends. This displays a full thumb-nailed list of all your friends on Facebook from which you can select either a few or all the friends you wish to invite. If you decide to select all your Facebook Friends at once, then simply copy and paste the code into your address bar and press Enter which will auto-select all the Friends in your list. Depending on the number of friends you have on your list, this process might take a little waiting for the program to select everyone. Once all your friends have been selected, you can now Suggest/Invite (Send Invitations) them to join the Facebook Fan page in question.
While some users have reported that this program no longer works or crashes Web browsers, more often than not it is only just taking its time to load depending on your Internet speed and number of the Friends list. Not sure how long before it stops working though but it may be worth giving a try while it lasts!
Which factors determine whether or not you suggest a Fan page to your Friends on Facebook?