Ahh F'ing FF, this was done in FF. Previewed OK, The preview open a new window, using javascript, do you have a popup blocker running.
Oddly though, the close window link IE doen't work, But I have lots of problems on this PC with JavaScript anyway. (works in FF)
Why FF anyway, if you want to be really non-standard use Microsoft Products.
No serioulsy FF is good, but very strict on code. IE just renders everything.