why not download a supervised classifier:
eg the tiblburg mbl system:
convert your data into a format it understands (c4.5 is probably best as you
can also use the decision tree format) and then away you go.
alternatively, if you really want a text classification system (tm), check:
the rainbow system:
http://www-2.cs.cmu.edu/~mccallum/bow/rainbow/
Miles
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