plpgsql test function

This simple test function fails.

----------------------------------------------
drop function testit(text);
create function testit(text) returns text as '
DECLARE
myval text;
BEGIN
myval:= $1;
return myval;
END;
' language 'plpgsql';

select testit('testing');
select testit(''testing'');
----------------------------------------------

Result:

DROP
CREATE
ERROR: parser: parse error at or near ""
ERROR: parser: parse error at or near "testing"

It doesn't seem like the parameter passing mechanism is working.
What am i missing?

TIA,
-km

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