Turn my box code into a function

Yeh I made that box code thing awhile ago that wont let you touch a box and is glich free (see download). Yeh well in my previous post Blanius suggested I turn it into a function. I kinda just passed it by but now Ireally would like to know how to do something like that. I saw blanius's functions (ie randomRange) and would like to know how to build one for my box code thing. I really have no clue where to start so a "beginers" take on the explanition may be needed to prevent more questions. Thanks.



PS: to move the guy in this box download the keys are w-up s-down a-left and d-right

PSS: http://members.aol.com/wolfsrein77/box.swf click here to see it in action