TagPro Move Spectator

// ==UserScript==
// @name       		Tagpro Move Spec
// @version    		0.1
// @description  	Use arrow keys to move the camera while spectating. Shift doubles the speed, ctrl halves it
// @include			http://tagpro-*.koalabeast.com:*
// @require			http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.js
// @author			Some Ball -1
// ==/UserScript==

$(function() {
    tagpro.ready(function() {
        //change this number to modify the speed of the camera movement
        //2 is on the slower end, 5 is decent, 10 is pretty fast, play around with it
        var jumps = 5; //default is 5
        
        var shift = false;
        var ctrl = false;
        function begin()
        {
            var clearable = -1;
            var adds = {
                37: 0,
                38: 0,
                39: 0,
                40: 0,
            };
            function move()
            {
                tagpro.viewPort.source.x += (adds[39]-adds[37])*jumps*(shift?2:1)*(ctrl?.5:1);
                tagpro.viewPort.source.y += (adds[40]-adds[38])*jumps*(shift?2:1)*(ctrl?.5:1);
            }
            $(document).keydown(function(key) { //37 <, 38 ^, 39 >, 40 down
                shift = key.shiftKey;
                ctrl = key.ctrlKey;
                if(key.which>=37 && key.which<=40)
                {
                    if(tagpro.viewPort.followPlayer)
                    {
                        tagpro.viewPort.followPlayer = false;
                        tagpro.viewPort.source = {x: tagpro.viewPort.source.x,
                                                  y: tagpro.viewPort.source.y};
                    }
                    adds[key.which] = 1;
                    if(clearable==-1) //no key was previously pressed
                    {
                        clearable = setInterval(move, 15);
                    }
                }
            });
            
            $(document).keyup(function(key) {
                shift = key.shiftKey;
                ctrl = key.ctrlKey;
                if(key.which>=37 && key.which<=40)
                {
                    adds[key.which] = 0;
                    if(adds[37]+adds[38]+adds[39]+adds[40]==0) //no keys still pressed
                    {
                        clearInterval(clearable);
                        clearable = -1;
                    }
                }
            });
        }
        
        setTimeout(function() {
            if(tagpro.spectator)
            {
                begin();
            }
        }, 750);
    });
});