//LazyLoad
//CreateTime:2010.11.15
var lazyLoad = {
	Init : function(){
		return $("img[lazyload]");
	},
	Calculate : function(lazyloadobject){
		var windowHeight = $(window).height();
		var arrReturn = {};
		var _scrollTop;
		if(lazyloadobject.length==0){
			return null;
		}
		else{
			lazyloadobject.each(function(i){
			    _scrollTop = parseInt($(this).offset().top - windowHeight);
				if(!arrReturn.hasOwnProperty(_scrollTop)){
				    arrReturn[_scrollTop] = new Array();
				}
				arrReturn[_scrollTop].push($(this));
			});
			this.ArrLoad = arrReturn;
			return arrReturn;
		}
	},
	ArrLoad : null,
	IsLoad : function(scrolltop,objectstop){
		if(objectstop!=null&&objectstop!={}){
		    for(i in this.ArrLoad){
		        if(parseInt(i)<=scrolltop&&this.ArrLoad.hasOwnProperty(i)){
		            for(j=0;j<this.ArrLoad[i].length;j++){
		                this.ArrLoad[i][j].attr("src",this.ArrLoad[i][j].attr("lazyload")).removeAttr("lazyload");
		            }
		            delete this.ArrLoad[i];
		        }
		    }
		}
	},
	Run : function(){
		var lazyLoadObject = this.Init();
		this.Calculate(lazyLoadObject);
		arrScrollTop = this.ArrLoad;
		if(arrScrollTop==null){
			return false;
		}
		else{
			var _this = this;
			_this.IsLoad($(window).scrollTop(),arrScrollTop);
			$(window).scroll(function(){
				_this.IsLoad($(this).scrollTop(),arrScrollTop);
			});
		}
	}
}

$(function(){
	lazyLoad.Run();
});

$(window).resize(function(){
    lazyLoad.Run();
});