I just tried it on an old FreeBSD Opera and saw the blank screen. I guess I have to fix if it breaks IE (I use any of Firefox, Safari and Konqueror without any problems.)
Maybe I need to add a php browser detect to conditionally include the JavaScript. Or maybe I just need to fix the JavaScript.
Bill H
perl -e 'print sub { "Hello @{[shift->()]}!\n" }->(sub{"World"})'