var nextImgNbr = 3;
var toHide = '#iphone_img0';
var toShow = '#iphone_img1';
var slideDelay = 5000;
var transitionDelay = 1000;

function startSlideShow() {
  setTimeout('slide();', slideDelay);
}

function slide() {
  $(toHide).animate({ left: '+=234' }, transitionDelay, null);
  $(toShow).animate({ left: '+=234' }, transitionDelay, function() { slideFinished(); } );
}

function slideFinished() {
  if(toShow == '#iphone_img0') { 
    toHide = '#iphone_img0';
    toShow = '#iphone_img1';
  } else {
    toHide = '#iphone_img1';
    toShow = '#iphone_img0';
  }

  $(toShow).css('left', '-234px');
  $(toShow).attr('src',"media/ss-"+nextImgNbr+".png");
  nextImgNbr = nextImgNbr%8+1;

  setTimeout('slide();', slideDelay);
}