Converting from rich black to flat black

We have a syndications service from which we download CMYK .jpg files. Sometimes the files are flat black and they print in color just fine. Other times the .jpgs are rick black and the printing result is muddy, if not downright illegible.
Is there a way to take those CMYK .jpg files and convert them to flat black instead of rich black? I'm wondering if there is an easier way than having to go in and change all the values individually to achieve a better printing result.
Using:
Windows
PC
PS CS4.
Thanks in advance.

Create a selection from the black channel, subtract that info from the cyan, magenta, yellow channels. Takes 10 seconds. May not always be correct, though.
Mylenium

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