How to insert large objects?

Hi All,

I'm creating a Delphi client App, that is connected to a POSTGRES 
server via ODBC.  This app will need to display image files (large objects).

I don't need to insert image files with the Delphi App, just display them.
Reading the ODBC FAQ I see that I need to create a type called:
lo
CREATE TYPE lo (  internallength=4, externallength=10,  input=int4in, output=int4out,  default='', passedbyvalue
);

Reading through the archives I see where some people have been able
to insert large objects "manually".  What does this mean and how do I
do it.  How do I insert an image file now that I have a type of lo?

Any help or suggestions would be most appreciated?

Thanks in advance,

Barry