LG Tiny MCE + Tinybrowser, problem with Firefox

I implemented LG Tiny MCE and Tinybrowser, following these instructions.

I can browse and upload images, but I can’t insert images using Firefox (3.5.5, Mac). I get the following javascript error:

selectURL is not defined
function onclick(event) { selectURL("/images/uploads/example.jpg"); }(click clientX=80, clientY=176)

I’d appreciate any help 😊