if (screen.width <= 1024) {
	  var $file = "bg_view_1229.jpg";
  }
  else if (screen.width <= 1280) {
	  var $file = "bg_view_1638.jpg";
  }
  else if (screen.width <= 1440) {
	  var $file = "bg_view_1440.jpg";
  }
  else if (screen.width <= 1680) {
	  var $file = "bg_view_1680.jpg";
  }  
  else if (screen.width <= 1920) {
	  var $file = "bg_view_1920.jpg";
  }
  else {
    var $file = "bg_view_1920.jpg";
  }

  document.write("<style type=\"text/css\">");  
  document.write("body { background: url('images/"+$file+"') top center; background-repeat: no-repeat; background-attachment: fixed;)");  
  document.write("</style>");