Create lo Data type

We are having Postgrsql 7.3.2.
To create lo type we gave the following SQL.
CREATE TYPE lo (
     internallength=4,  externallength=10,
     input=int4in, output=int4out,
     default='',  passedbyvalue
);

But we could not create this lo type. It gives the following
error.
**********
Failed to execute SQL : SQL CREATE TYPE lo ( internallength=4,
externallength=10, input=int4in, output=int4out, default='',
passedbyvalue ); failed : ERROR: TypeCreate: function int4out(lo)
does not exist
*************

Can any one help us? please....

Regards,
A.Mohan
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