Checking if referrer is web crawler

Hi. I have a book affiliate website. Whenever a visitor clicks on one
of the books, a script adds one to a field in a mysql database and then
takes the visitor to the shopping basket on the book website.

I have noticed that the book links are getting lots of hit. At first, I
was pleased about the potential income this might mean - but then it
occurred to me that many of these hits are web crawlers (this was
confirmed by webaliser).

Any suggestions of ways of checking if the link is being "clicked" by a
webcrawler so that I can not increment the field in the sql database?

I've checked HTTP_REFERER but it seems to be empty for what I assume
are crawled clicks.

Cheers

Steve

.

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