Problems with PLPGSQL

Hi,
I have a problem with quoting  in one of my functions:

now TIMESTAMP := ''now'';
FOR myRec IN SELECT * FROM myTable WHERE job_end + ''360 Min'' > now LOOP

I want to replace the 360 with the contents of a passed value

but for some reason I can't quote it. ... job_end + ''$1 Min'' does not
work.

Could anyone help me out here ?


On the subject:
The whole quoting in PLPGSQL seems to create many people a headache...
is there any plan to make it a bit more user friendly?

Thanks
Alx