HELP!

HELP!

I am very new to this, reasonably competent in HTML and CSS.

I need to change this from an 'on click' function, to automatically move every 4-5 seconds.
Whats more, if possible, I would like to change it further by having each object move back slightly then to accelerate off the screen instead of leave at a fixed rate of speed.

Is this possible?

  2.   $('.box').click(function() {
  3.     $('.box').animate( function() {
  4.         if ($(this).offset().left < 0) {
  5.             $(this).css("left", "150%");
  6.         }
  7.     });

  9.     $(this).animate({
  10.          left: '-50%'
  11.      }, 500);
  12.  
  13.      if ($(this).next().size() > 0) {
  14.          $(this).next().animate({
  15.              left: '50%'
  16.          }, 500);
  17.      } else {
  18.          $(this).prevAll().last().animate({
  19.              left: '50%'
  20.          }, 500);
  21.      }
  22. });