Necroman wrote this excellent .dll and with it came a huge readme.html file. If there's nothing there for the back buttons then it's probably not possible without modifying the .dll. I set the .dll up in my script to operate from inside mIRC, which (I feel) is better than the dialogue because it reduces the number of windows you have open. To go 'back' you just right click and press 'Back'. Same as Internet Explorer :-) not discounting the fact that IE does have a Back Button.
