[PD] Please help with a patch i want to do

[arm pdlist]

I've been scratching my idea for a few hours and i
can't do the patch i want. Here's the deal:

I have a slider that outputs values from 0 to 100.
Then, say from 0 to 20 i want to trigger file1.avi,
from 21 to 40, trigger file2.avi, and so on. The
problem is that whenever i change the slider within a
certain range (say range from 0 to 20) the file is
always being triggered. I want to trigger the file
when the value of the slider is within a certain
range, but the following values within that same range
shouldn't trigger the file again. For example, when
the value is 14 it would trigger the file for the
first time, but if the following value is 15 i don't
want to trigger the file again. I just want to triger
a file when the first value of a certain range is
received, the other following values of the same range
shouldn't trigger that file again.

I hope i explained well my problem. Any tips (object,
some logic, etc.) of how to do this?

Thanks in advance.

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