There was an interesting summary of user behavior in response
to pop-ups on the CHI-WEB list last fall:
http://www.acm.org/archives/wa.cgi?A2=ind0110d&L=chi-web&;
F=&S=&P=476
In terms of usability the problem is not javascript but the habits
of users, who may be conditioned to ignore or close popups
without reading them.
