app.namespace("appLib");

appLib.Input = function(){
            var self = this;
            var map    = { 38: "U", 40: "D", 37: "L", 39: "R" };
            self.state = { U: false, D: false, L: false, R: false };            
            self.keydown = function(evnt){
                var mKey = map[evnt.which];
                if(mKey != "undefined"){
                    self.state[mKey] = true;
                }
            }
            
            self.keyup = function(evnt){                
                var mKey = map[evnt.which];
                if(mKey){
                    self.state[mKey] = false;
                }
            }
            
            $(document).keydown(self.keydown);
            $(document).keyup(self.keyup);
        }