function move_me();      //currently an invalid prototype
function move_you();     //also currently an invalid prototype
...
... various stuff
...
function move_others()
{
   move_you();   //can use move_you cause it gets filled later
   move_me();    //CANT use move_me, will crash running this line
}
...
...
...
function move_you()    //makes move_you NO-LONGER an "empty prototype"
{
   you.x += 5;
   //do whatever
}