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        var index=1;
        $(".prev").on("click",function(){
            if(index == 1){alert("已经到第一张了!");return false;}
            scrollFun(--index)
        });
        
        $(".next").on("click",function(){
            if(index == "464"){alert("已经到最后一张了!");return false;}
            scrollFun(++index);
        });
        function scrollFun(x){
           $("#showImg").attr("src","");
           $("#showImg").attr("src","images/hw ("+x+").jpg"); 
        }
        $(".bigImg").click(function(){
            if($(this).hasClass("on")){
                $(this).removeClass("on")
                $(this).attr("title","点击缩小");
                $(this).animate({"width":"50%"});
            }else{
                $(this).addClass("on")
                $(this).attr("title","点击放大");
                $(this).animate({"width":"35%"});
            }
        })
        $(".muList a").on("click",function(){
            index = $(this).attr("data-id");
            scrollFun(index);
        });
        function adsFun(param){
            var u=window.location.toString(),
                r=new RegExp("\\?(?:.+&)?" + param + "=(.*?)(?:&.*)?$");
            if(param=="usurl"){
                return u.substring(u.indexOf("usurl=")+6);
            }   
            var m = u.match(r);   
            return m ? decodeURIComponent(m[1]) : "";
        }
        var pageId = adsFun("id");
        if(pageId){
            index = pageId;
            scrollFun(index);
        }
    });
document.body.onselectstart = document.body.ondrag = function(){
	return false;
}