$(document).ready(function(){

  var oldimage = $(".slider-items a:first").attr("href");
  var newimage = $(".slider-items a:first").attr("href");

  $(".main-img .newimg").attr({
  src: newimage
  });

  $(".main-img .oldimg").attr({
  src: oldimage
  });
  
  var flag = false;
  var nextSrc = "";
  var curHref = "";

  $(".slider-items a").click(function(){
    curHref = $(this).attr('href');
    if ( !flag )
    {
      var img = new Image();
      img.onload = onLoadImage;
      img.src = curHref;
    }
    else
    {
      nextSrc = curHref;
    }
  return false;
  });

function onLoadImage()
{
    flag = true;
    oldimage = newimage;
    newimage = curHref;
    $(".main-img .oldimg").attr({
    src: oldimage
    });
    $(".main-img .newimg").css("opacity", 0);
    $(".main-img .newimg").attr({
    src: newimage
    });
    $(".main-img .newimg").animate({opacity: "1"}, "slow", function(){
      flag = false;
      if(nextSrc)
      {
        var tmpSrc = nextSrc;
        nextSrc = '';
        $('.slider-items a[href='+tmpSrc+']').click();
      }
    });
    return false;
}

});