anchor.diff:  var updateInterval = 60000;
  +var intervalID = null;
   
   $(document).ready( function() {
     changeBackgroundColor();
  
positive.code:   $("html").css("background-image", "url(\"" + url + "\")");
  }
  
  function changeBackgroundColor() {
    $.ajax({
      url:"/api/sky_color.json",
      dataType:"json",
      complete: function(data) {
        $("html").css("background-color", data.responseJSON);
  
negative.code:   $("html").css("background-position", "top left");
    updateHarvestData(getURLParam("days"));
  
    intervalID = window.setInterval(function() {
      changeBackgroundColor();
      updateHarvestData(getURLParam("days"));
    }, updateInterval);
  });
  