Java APIs

I'm very new to JavaDoc and am trying to document a full package of classes. These classes are not contained in a jar file.

The following structure exists starting at C:\WSAD\tc_1\tc_1\om:

om.co
Class A - object & source
Class B - object & source
om.co.allocsea
Class C - object & source
Class D - object & source
om.co.omcst
Class E - object & source
Class F - object & source

I've tried documenting the entire package using:

javadoc -sourcepath C:\WSAD\tc_1\tc_1\om om.co om.co.omcst om.co.allocsea -d C:\WSAD\tc_1\tc_1\om\Doc

But get the following message:
Loading source files for package om.co...
javadoc: warning - No source files for package om.co
Loading source files for package om.co.omcst...
javadoc: warning - No source files for package om.co.omcst
Loading source files for package om.co.allocsea...
javadoc: warning - No source files for package om.co.allocsea
Constructing Javadoc information...
javadoc: warning - No source files for package om.co
javadoc: warning - No source files for package om.co.omcst
javadoc: warning - No source files for package om.co.allocsea
Standard Doclet version 1.4.1

I can JavaDoc the classes in each directory using:
javadoc -sourcepath C:\WSAD\tc_1\tc_1\om\co\*.java om.co om.co.omcst om.co.allocsea -d C:\WSAD\tc_1\tc_1\om\Doc

but then I get a separate set of documentation for each directory. i.e.: run the command for om.co.allocsea & om.co.omcst, etc.

Any suggestions as to what I may be missing?

Thanks.