var stop=true;

		$(window).scroll(function(){

			totalheight = parseFloat($(window).height()) + parseFloat($(window).scrollTop());

			if($(document).height() <= totalheight){

				if(stop==true){

					stop=false;

					$.post("http://www.lovexm.com/test.php", {start:1, n:50},function(txt){

						$("#pro-list-li").after(txt);

						stop=true;

					},"text");

				}

			}

		});