$(document).ready(function() {
  if (!( $.browser.msie && $.browser.version.substr(0,1)<7)) {
    $('#backscroll1').css({backgroundPosition: '0px 460px'});
    $('#backscroll2').css({backgroundPosition: '0px 460px'});
    $('#backscroll3').css({backgroundPosition: '0px 460px'});
    
    $('#backscroll3').animate({
      backgroundPosition:"(-10000px 460px)"}, 120000, 'linear');
    
    $('#backscroll2').animate({
      backgroundPosition:"(-10000px 460px)"}, 240000, 'linear');
    
    $('#backscroll1').animate({
      backgroundPosition:"(-10000px 460px)"}, 480000, 'linear');
  }
});