Googlebot chasing .php tracking script

is robots.txt enough?

[Edouard_H]

I recently added an ROI tracking program to a site and I'm pretty happy with the reports it produces. The following code is placed on the pages to implement the tracking (altered for this post):

<script type="text/javascript" src="/a-tracking-script.php?d=tracking-code&amp;mode=a-mode"></script>
<script type="text/javascript" src="/a-different-tracking-script.php?referrer-id=another-mode"></script>

Here is Googlebot's behavior on its last two visits. It's ignores new content pages altogether, looks for the tracking .php files and leaves.

GET / HTTP/1.0" 200 10780 "-" "Googlebot/2.1

GET /a-tracking-script.php?d=tracking-code&amp;mode=a-mode HTTP/1.0" 302 0 "-" "Googlebot/2.1

GET /a-different-tracking-script.php?referrer-id=another-mode HTTP/1.0" 200 563 "-" "Googlebot/2.1

GET /a-tracking-script.php?d=tracking-code&amp;mode=a-mode HTTP/1.0" 302 0 "-" "Googlebot/2.1

Will disallowing these files in robots.txt be sufficient to encourage Googlebot to ignore these scripts?

I've considered using the javascript above in an external script in a disallowed directory, maybe with document.write, but it seems like an awful kludge. Still I don't want Googlebot wasting time and ignoring real content....

What would be the best method to blind it to the presence of the scripts?

[ThomasB]

robots.txt should help from my experience.