javascript 支持页码格式的分页类

/* 排序工具 by Funny ZAk <silenceacegmail.com> 2009-8-23
"调用方式 var zp = new zakPage(参数);zp.init();
参数以此为 源内容容器，分页结果容器，导航容器，页大小,单挑内容回调函数返回li对象,每个li的样式,选择后的样式没有则为null或""
，默认起始页数,格式化页码显示格式*/
function zakPage(id,pagec,navid,pagesize,lievt,ds,ss,idx,navp){
    this.obj = this;
    this.pageid = id;
    this.pagec = pagec;
    this.navc = navid;
    this.pagesize = pagesize || 7;
    this.lievt = lievt || null;
    this.rcount = 0;
    this.pagecount = 0;
    this.cpage = 1;
    this.ds = ds;
    if(this.ds == null){this.ds = "";}
    this.ss = ss;
    if(this.ss == null){this.ss = "";}
    this.idx = idx;
    this.navpre = navp || ["共{$pcount}页/{$rcount}条,当前第{cpage}页","首页","上一页","下一页","末页"];
    }
zakPage.prototype = {
    init:function(){
        document.getElementById(this.pageid).style.display = "none";
        this.rcount = document.getElementById(this.pageid).getElementsByTagName("li").length;
        var residue = this.rcount%this.pagesize;
        var nums = parseInt(this.rcount/this.pagesize);
        this.pagecount = nums;
        if(residue != 0){this.pagecount = nums+1;}
        this.gopage(this.idx);
        },
    guide:function(){
        var nav = document.getElementById(this.navc);
        var np = this.navpre;
        nav.innerHTML = np[0].replace("{$rcount}",this.rcount).replace("{$pcount}",this.pagecount).replace("{cpage}",this.cpage);
        nav.appendChild(this.createa(np[1],1));
        nav.appendChild(this.createa(np[2],this.cpage-1));
        nav.appendChild(this.createa(np[3],this.cpage+1));
        nav.appendChild(this.createa(np[4],this.pagecount));
        },
    createa:function(html,index){
        var aa = document.createElement("a");
        aa.innerHTML = html;
        var o = this.obj;
        aa.onclick = function(){o.gopage(index);}
        return aa;
        },
    gopage:function(index){
        if(index>this.pagecount){index=1;}
        if(index<=0){index = this.pagecount;}
        this.cpage = index;
        var ghtml = document.getElementById(this.pagec);
        ghtml.innerHTML = "";
        var pages = (index-1)*this.pagesize;
        var pagee = pages+this.pagesize;
        if(pagee>this.rcount){pagee = this.rcount;}
        for(var i=pages;i<pagee;i++){
                var lil = document.createElement("li");
                lil.className = this.ds;
                lil.innerHTML = this.litem(i);
                var sss = this.ss;
                if(this.lievt !=null){
                    lil.lievt = this.lievt;
                    lil.onclick = function(){
                        this.lievt(this);
                        this.className = sss;
                        }
                    }
                ghtml.appendChild(lil);
            }
         this.guide();
        },
    litem:function(index){
            return document.getElementById(this.pageid).getElementsByTagName("li")[index].innerHTML;
        }
    }