Preventing xterm from closing

Hi everyone.

I'm using the newest version of xterm and icewm window manager on Debian GNU/Linux. I have set up multiple workspaces and xterm is normally open on workspace number 1. My problem is that whenever I want to terminate some programs on other workspaces I keep closing xterm accidentally with the Alt + F4 keyboard shortcut. Is there any way to "lock" xterm, to prevent it from closing or to get it to ask me for confirmation before closing? If possible please do not sugest using any defferent window managers / terminals, I'd like stick to the ones I prefer. :-)

Any help will be greatly apperciated!

>>5
Oh wait, I get it ;)  Do what >>2 said, and remove the Alt-F4 mapping.

You really shouldn't be using Alt-Fx to switch workspaces though.  Alt-F2 is the ubiquitous shortcut to bring up a launch application window.