1. Upgrading from 3.xMoving from one 3.x version to the latest version should be no harder than replacing the old overlib.js with the new one. Changes on html pages should not be needed.
2. Migrating from 2.xTo make a transition to overLIB 3 from any version of overLIB 2 easy, almost full backward compatability has been secured. Please note that this does not work with the trimmed down version (overlib_mini.js).
All old functions are still supported, they are merely redirected to the new overlib() function with the correct parameters.
The cascading style sheet, overlib.css, is no longer used. All fonts are stored in the script and printed by font tags. Newer version of overLIB also support CSS commands.
The overlib() and nd() functions returns true or false so when moving to this function these can be removed from the hyperlinks.
All variables that define colors etc have changed names.
NOTE: All of the previous statements only pertain to overlib 3.x. Support for the old style 2.x calls has been dropped in version 4.00. The easiest migration path would be to first convert to version 3.x and then move on to version 4.00. The latter step should be very easy since all HTML calls should work without changes. Version 4.00 has introduced a lot of new commands but still supports all of the overlib 3.x commands.