i´m using the spriteanimation plugin spritley .

And now I want to change the .sprite({ speed: 4000}); through the arrowkeys, left and right using keydown.

But I have some problems with the syntax.

Could somebody take a look and can tell me how can I fix this?

1. var player = $('#draisine');
2. player.sprite({fps: 30, no_of_frames: 1, speed: 4000});
3.       
4.     //Draisine keydowns  
5. $(document).keydown(function(e){
6. switch (e.which) {
7. /*case 40: //down
8. player.animate({
9. top: "+=80"
10. });
11. break;*/
12. case 38: //up
13. player.animate({
14. top: "-=80"
15. }).animate({
16. top: "+=80"
17. });
18. break;
19. case 37: //left
20. player.sprite({
21.               speed: -= 1000; 
22.               if (speed < 1000) {
23.                 speed = 1000;
24.               }
25. });
26. break;
27. case 39: //right
28. player.sprite({
29.               speed: -= 1000;
30.               if (speed < 1000) {
31.                 speed = 1000;
32.               }
33.             });
34. break;
35. case 32: //space
36. player.animate({
37. top: "-=80"
38. }).animate({
39. top: "+=80"
40. }); 
41. }      
42. });