I'm not sure if this is actually possible to do, but if it is then I would be glad if you could give an example. Thx :P
script.Source
can be read and altered from higher leveled scripts like plugins, execute script, and the command line. From regular scripts and local scripts, you can't and you don't need to.
Go Here:
http://wiki.roblox.com/index.php?title=Special%3ASearch&profile=default&search=Access+The+Content+Of+One+Script+From+Another&fulltext=Search
This is no longer possible.
The Source
attribute provides the data you are looking for, but cannot be written to or read from for security reasons.