String replacement with sed

[jd]

I need to change a bunch of Analog config files; among other things
change the location of IMAGEDIR. I made this simple script:

#!/bin/sh
for loop in `ls analog/*`
do

        sed -e
'/IMAGEDIR/s/www2.3dresearch.com\/analog_images\//fiordiligi.3dresearch.com\/images\//p'
$loop > $loop.sed

done

It works fine, except I get duplicate lines, such as:

IMAGEDIR                http://fiordiligi.3dresearch.com/images/
IMAGEDIR                http://fiordiligi.3dresearch.com/images/

I want just a single line - what do I need to change?

Thank you for your insight...

jd

Janos Dohanics