Difference between Standard & Professional Version

Can anybody tell me What is the difference between a Standard ($395) and a Professsional Version ($950) and a site-license ($2450) ?

see the answers here -
http://www.activewidgets.com/javascript.forum.20807.1/mr-alex-pl-clarify-urgently.html

But you have not compared Standard ($395) with Site-License($2450).
ie., whether or not Standard is also browser independant ?

Thanks,

The developer license ($395) and site license ($2450) apply to the same code but offer different licensing terms - the developer license allows using the code by one developer only and the site license allows using the code by all developers in a single location.