util=function(){     return {         $:function(id){             return document.getElementById(id);         },         trim:function(str){             return str.replace(/(^\s+)|(\s+$)/g, "");         },         len:function(str){               return str.replace(/[^\x00-\xff]/g,'**').length;           },         format:function(str){             var arg = arguments;             return str.replace(/\{(\d+)\}/g, function(m, i){                 return arg[parseInt(i)+1];             });         },         each:function(object, callback, args){             var name, i = 0, length = object.length;             if ( args ) {                 if ( length === undefined ) {                     for ( name in object )                         if ( callback.apply( object[ name ], args ) === false )                             break;                 } else                     for ( ; i < length; )                         if ( callback.apply( object[ i++ ], args ) === false )                             break;             } else {                 if ( length === undefined ) {                     for ( name in object )                         if ( callback.call( object[ name ], name, object[ name ] ) === false )                             break;                 } else                     for ( var value = object[0];                         i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}             }         },         setCookie:function(name,value,hours,path,domain){             var str=new String();             var nextTime=new Date();             nextTime.setHours(nextTime.getHours()+hours);             str=name+"="+escape(value);             if(hours)                 str+=";expires="+nextTime.toGMTString();             if(path)                 str+=";path="+path;             if(domain)                 str+=";domain="+domain;             document.cookie=str;         },         getCookie:function(name){             var rs=new RegExp("(^|)"+name+"=([^;]*)(;|$)","gi").exec(document.cookie),tmp;             if(tmp=rs)                 return unescape(tmp[2]);             return null;         },         delCookie:function(name){             document.cookie = name + "=-1" + "; expires=Fri, 31 Dec 1999 23:59:59 GMT;";         },         /**         *url String         *parms String         *method String default value "get"         *asy Boolean defalut value true         *success Function(http_request.responseText)         **/         ajax:function(config){             var url=config.url,                 parms=(config.parms?config.parms:"") + "&t="+new Date().getTime(),                 method=config.method||"get",                 asy=true;             var http_request=null;             if(method.toLowerCase()=="get"){                 url=url+"?"+parms;                 parms=null;             }             //开始初始化XMLHttpRequest对象             if(window.XMLHttpRequest) { //Mozilla 浏览器                 http_request = new XMLHttpRequest();                 if (http_request.overrideMimeType) {//设置MiME类别                     http_request.overrideMimeType("text/xml");                 }             } else if (window.ActiveXObject) { // IE浏览器                 try {                     http_request = new ActiveXObject("Msxml2.XMLHTTP");                 } catch (e) {                     try {                                        http_request = new ActiveXObject("Microsoft.XMLHTTP");                     } catch (e) {}                 }             }             if(!http_request) { // 异常，创建对象实例失败                 throw new Error("不能创建XMLHttpRequest对象实例.");                 return null;             }             http_request.open(method,url,asy);             http_request.onreadystatechange=function(){                 if (http_request.readyState == 4){                     try{                         if (http_request.status == 200){                             config.success(http_request.responseText);                         }                     }catch(e){                         throw new Error("数据读取失败.");                     }                 }             };             if(method.toLowerCase()=="post"){                 http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");             }             http_request.send(parms);         }     }; }();