You must be the one who posted Check for popups in webpage (originally titled "Popup killer"). The problem is that what you want is not going to be easy. You want a Perl script to monitor and intervene with Netscape. Well, while your Perl script can be changed, Netscape is a compiled binary. You could recompile Netscape with changes that you made to the source to feed the requested data to your Perl script. But that's a game i would rather not play. You have already stated that this is for Unix ... so OLE control seems right out (and that's another game i would rather not play).

Now then, the one thing that you have not told is why you want to do this. Most people leave out the why either because they don't think it is relevant (it is always relevant) or because they want to retain confidentiality. If you are planning on writing some commercial "Popup killer", then good luck. But if you are simply trying to prevent those annoying popups from ... popping up, switch to a browser that gives you that control (i prefer Mozilla).

UPDATE:
Maybe Mozilla's XUL will be of help to you.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)