Upgrading to 5.0 from 1.4.8

There are some compatilibility issues with this upgrade pertaining to xml stuff that my company uses. Notes say to download org.apache.xalan classes but I'm unsure how to do that. I have downloaded a xalan.jar file but this does not fix the problem.

Compiler in Eclipse says that the object cannot be resolved to a type which tells me it doesn't know anything about the interface and classes used.

I do not know what to do

[445 byte] By [ValaChicka] at [2007-10-3 1:21:08]