pg equivalent to MS SQL exec command

Hi,

I have moved a database from MS SQL to PG and am now
trying to move my stored procedures.  I have created a
PG function and am trying to figure out how to execute
it without using a trigger.  In MS, I would type 'exec
stored_procedure_name'.  Is there an equivalent in PG.
 I have tried the 'execute' command but that seems to
work only within a function.  I wish to execute this
function when I feel like it, not on a fixed schedule.
 Did I miss something in the documentation?

Thanks,
Troy

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