this isn't to hard to accomplish, you just need to set the postion of you character holding both weapons, and have one of the weapons showing false while the other one is shwoing true, and have the change weapon button change these, i'll make a quick example of how to do this.

EDIT: Okay, so just press 1 or 2 in my example in you'll change weapons, look at the coding I did and you'll figure it out pretty easily

changing the weapons is a pretty basic idea, all you need to realize is that all the weapons are already there in place, but are just hidden until the user inputs something into the game to make it appear(example I made you press 1 or 2 to change weapons) it's really about how you want to set up the animation in which it becomes a little more tricky instead of a simple one goes away while the othere appears, just use some common sense with the example I gave you and you should be fine

If you are stuck on a project, check out the tutorials I made here at this link:

http://alice.org/community/showthread.php?p=36778#post36778

There are lots of tutorials on it so far, including some youtube videos, check it out

Or..

Go to my youtube channel to check out my alice 2.2 tutorials I have there..