Of course it is. You'll have to follow the logic of the script and edit it accordingly, that's really all that can be suggested.
Add a condition to the if that detects the pages you want to run/not
run it on.
like, if it's currently
if(cow>37){page.screwup();}
change it to
if (cow>37||document.getElementById('frab_div')){page.screwup('wont be
screwed up since it only runs on pages that have frabdiv);}
