if(navigator.userAgent.indexOf("MSIE")>0){if(navigator.userAgent.indexOf("MSIE 6.0")>0||navigator.userAgent.indexOf("MSIE 7.0")>0){alert("您正在使用的是老旧IE浏览器，请下载最新版本浏览，谢谢。");}}

$(document).ready(function(){
	$(".floatBox").floatadv();
});

jQuery.fn.floatadv = function(loaded) {
	var obj = this;
	body_height = parseInt($(window).height());
	block_height = parseInt(obj.height());
	
	top_position = parseInt((body_height/2) - (block_height/2) + 

$(window).scrollTop());
	if (body_height<block_height) { top_position = 0 + $(window).scrollTop(); };
	
	if(!loaded) {
		obj.css({'position': 'absolute'});
		obj.css({ 'top': top_position });
		$(window).bind('resize', function() { 
			obj.floatadv(!loaded);
		});
		$(window).bind('scroll', function() { 
			obj.floatadv(!loaded);
		});
	} else {
		obj.stop();
		obj.css({'position': 'absolute'});
		obj.animate({ 'top': top_position }, 400, 'linear');
	}
}