How do I create a custom error page or action for firefox/iceweasel on an embedded linux device?

Q. I am developing a small embedded debian linux device with firefox/iceweasel and a 7" touchscreen display. I need to create a custom action/response/page/redirect when the device boots and can not connect to the network (i.e. some 4xx http error, can't reach http://www.linux.org/). Is there something built into firefox? If not, any other ideas? Thank You!!!

A. custom error 404

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http://www.knowledgesutra.com/forums/topic/22491-custom-404-error-pages/

Original Question

Is software I write for one Linux distribution compatible for all Linux distributions?

Q. I'm thinking about writing some stuff for an easy to get distro like Ubuntu, then trying it on an embedded Linux platform with an ARM processor.

Will I have issues porting it over?

I'm not a computer newb entirely, but I am a Linux newb for the most part.

A. Probably... Everything in linux is built from packets (As you probably know by now) - you want to make sure you know which packets you need... My APGUI project needs GTK, Python, Pygtk and APG before it will run...

If your app is entirely self-contained... Gratz, you are one of the only 5 people who write apps that way :)

Original Question

How can I get an introduction as to how Linux is used in Embedded Applications?

Q. I wish to have a dive (not swim very deep though) into Embedded Linux.
Are there any good resources on the internet that you would like to recommend?
Please note that I know the C language inside out and have also done micro-controllers programming even though it was without any RTOS.

A. See the guide here: http://www.scratchbox.org/documentation/general/tutorials/introduction.html

Original Question

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