Trigger to limit number of rows in another table

[Davor Geci]

Can you help me with 2 triggers on 2 tables?
I have Table1 that is having fields:
ID
MaxNumberOfRowsTable2
UserID

Table2 with fields:
ID
Name
UserID

I need to create a trigger on Table1 that will fire every time I change a field MaxNumberOfRowsTable2 and delete all extra rows in Table2 ordered by ID.

For example if Table2 is having 100 rows and we change the MaxNumberOfRowsTable2 field in Table1 to value 15, the trigger should delete all the rows in Table2 and only leave the 15 oldest records.
Can anyone help me with this trigger?

Thanks,
Davor