Redefine default button behavior

I use my custom page as final one. There are 3 standard buttons there.

Is it possible to bring CANCEL button to execute my function instead of quitting?

without using additional plug-ins if possible

yes, 820815, this is it.

Thanks a lot!

One more question. CANCEL button I redefined and it brings user to my site after clicking. X-button in the upper right corner disabled.

BUT! I have a button on my mouse which I use for closing applications. So ... when I press it on installer it works like CANCEL and therefore opens browser.

Any thoughts?

Thanks

And what did you expect?
Mouse button do the same as Cancel, "X", Alt+F4, ...