Dbms_job - changing next date when run from itself

Hi,
 
Can you change the next date of a job from a procedure that is called by the job you are changing? 
I have a dbms_job that is scheduled to run on the first monday of the month. The job runs a procedure and this procedure needs to schedule the job at the end of it so that it is ready to run next month (1st monday).
 
So my initial setup is something like
 
dbms_job.submit(101, '02-oct-2006', 'sysdate + 35')
 
and this should run on the 2nd of October and then it will be scheduled to run next on the 6th of November (sysdate of date it ran + 35).
 
I change the interval as part of the procedure as it would need to be sysdate + 28 to get the first monday in december 
I think this is all fine and as expected and should work.
 
My problem is that the job can be run manually also so say on the 16th of October someone runs it. The next run date is now 16th oct + 35 and I recalculate the interval to be sysdate + 21 (to get to next months first monday) . This is wrong as what I want is next run to be 6th November with interval of 21 days. 
I have tried doing a next_date on the job but it always seems to use the interval and ignores the date I give it?? This is only when the job resets itself, as when I just call the procedure (ie not from the job) then next_date works and it gets the date I want??
 
Hopefully this makes sense as it is not that easy to explain...
 
Basically what I want to do is make sure the job is run on the first Monday of the next month (or this month if the job was run before the first monday of this month) regardless of when it was last run.
 
thanks

I have found a solution - simply use a function as the interval parameter and build all the logic you want into that :)

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