I've got this code, but I need to make it loop?

2. jQuery(function($) {
3. var timer;
4. function Cloud(event)
5. {
6.      $("#cloud").css("opacity","0");
7.      $("#cloud").css("left","-600px");
8.     $("#cloud").animate({"opacity":1,"left":1600},20000, "linear", null);
9.      $("#cloud").css("left","1024px");
10.     $("#cloud").animate({"left":-600},20000, "linear", null);
11. }
12. 
    
13. Cloud();
14. 
    
15. });

If anyone could help I'd be much appreciative.

Thanks,

Chris