$(document).ready(function(){
	lazyLoad(".floor1-3,.floor2,.floor3,.floor4,.footer");
});
//懒加载
function lazyLoad(regions,options){
	options=options||{};
	var multiple=options.multiple||1.5;  //默认加载1.5屏
	var jqRegions=$(regions);
	var jqLazyObjects=jqRegions.find("img[src2], iframe[src2]"); //兼容了img和iframe
	var isIPad=navigator.userAgent.toLowerCase().match(/iPad/i)=="ipad";
	var documentHeight=document.documentElement.clientHeight;
	this.load=function(){			
		var scrollTop=isIPad?window.pageYOffset:Math.max(document.documentElement.scrollTop,document.body.scrollTop);
		jqLazyObjects.each(function(){
			var element=$(this);
			var elementTop=element.offset().top;
			if(elementTop<=(scrollTop+parseInt(documentHeight*multiple))){
				var val=element.attr("src2");				
				if (val) {
					element.attr("src",val).removeAttr("src2")					
				}
			}
		});		
	};
	this.bindScroll=function(){$(window).bind("scroll",this.load);};
	this.bindScroll();
	this.load();
}