$.fn.smartFloat = function() {
        var position = function(element) {
           var top = element.offset().top,
            pos = element.css("position");
            $(window).scroll(function() {
                var scrolls = $(this).scrollTop();
				//定位用
				var sWidth=($(window).width()-970)/2-30;
				element.css({right:sWidth}).show();
               
			   if (scrolls > top) {
					
                    if (window.XMLHttpRequest) {
                        element.css({
                            position: "fixed",
                            top: sWidth
							
                        });
                    } else {
                        element.css({
                            top: scrolls+sWidth
                        });
                    }
                } else {
                    element.css({
                        position: "absolute",
                        top: top+sWidth
                    });
                }
            });
        };        return $(this).each(function() {
            position($(this));
        });
    };
$(document).ready(function(e) {
    	$("body").append("<div class='float' style=' position:absolute;top:0;'><a href='http://zt.glass.com.cn/meeting/glass/2011topten/' target='_blank'><img src='http://meta.glass.com.cn/glassad/action/2011/1_top10result_30x220.jpg' alt='玻璃行业十大品牌评选结果'  /></a></div>");
    $(".float").smartFloat().hide();
});