/*--------------------------------------
Name: AJAXRequest
Version: 0.8.06
Author: xujiwei
E-mail: vipxjw@163.com
Website: http://www.xujiwei.cn/
License: http://www.gnu.org/licenses/gpl.html GPL
Copyright (c) 2006-2008, xujiwei, All Rights Reserved

AjaxRequest Deveoper Manual:
    http://ajax.xujiwei.cn/
--------------------------------------*/
function AJAXRequest(){
var xmlPool=[],objPool=[],AJAX=this,ac=arguments.length,av=arguments;
var xmlVersion=["MSXML2.XMLHTTP","Microsoft.XMLHTTP"];
var ec=emptyFun=function(){};
av=ac>0?typeof(av[0])=="object"?av[0]:{}:{};
var encode=$GEC(av.charset+"");
var prop=['url','content','method','async','timeout','ontimeout','onrequeststart','onrequestend','oncomplete','onexception'];
var defval=['','','GET',true,3600000,ec,ec,ec,ec,ec],l=prop.length;
while(l--){this[prop[l]]=getp(av[prop[l]],defval[l]);}
if(!getObj())return false;
function getp(p,d){return p!=undefined?p:d;}
function getObj(){
var i,j,tmpObj;
for(i=0,j=xmlPool.length;i<j;i++)if(xmlPool[i].readyState==0||xmlPool[i].readyState==4)return xmlPool[i];
try{tmpObj=new XMLHttpRequest;}
catch(e){
for(i=0,j=xmlVersion.length;i<j;i++){
try{tmpObj=new ActiveXObject(xmlVersion[i]);}catch(e2){continue;}
break;}}
if(!tmpObj)return false;
else{xmlPool[xmlPool.length]=tmpObj;return xmlPool[xmlPool.length-1];}}
function $(id){return document.getElementById(id);}
function $N(d){var n=d*1;return(isNaN(n)?0:n);}
function $VO(v){return(typeof(v)=="string"?(v=$(v))?v:false:v);}
function $GID(){return((new Date)*1);}
function $SOP(id,ct){objPool[id+""]=ct;}
function $LOP(id){return(objPool[id+""]);}
function $SRP(f,r,p){return(function(s){s=f(s);for(var i=0;i<r.length;i++)s=s.replace(r[i],p[i]);return(s);});}
function $GEC(cs){
if(cs.toUpperCase()=="UTF-8")return(encodeURIComponent);
else return($SRP(escape,[/\+/g],["%2B"]));}
function $ST(obj,text){
var nn=obj.nodeName.toUpperCase();
if("INPUT|TEXTAREA|OPTION".indexOf(nn)>-1)obj.value=text;
else try{obj.innerHTML=text;}catch(e){};}
function $CB(cb){
if(typeof(cb)=="function")return cb;
else{
cb=$VO(cb);
if(cb)return(function(obj){$ST(cb,obj.responseText);});
else return this.oncomplete;}}
function $GP(p,v,d,f){
var i=0;
while(i<v.length){p[i]=v[i]?f[i]?f[i](v[i]):v[i]:d[i];i++;}
while(i<d.length){p[i]=d[i];i++;}}
function send(purl,pc,pcbf,pm,pa){
var ct,ctf=false,xmlObj=getObj(),ac=arguments.length,av=arguments;
if(!xmlObj)return false;
var pmp=pm.toUpperCase()=="POST"?true:false;
if(!pm||!purl)return false;
var ev={url:purl,content:pc,method:pm};
purl+=(purl.indexOf("?")>-1?"&":"?")+"timestamp="+$GID();
xmlObj.open(pm,purl,pa);
AJAX.onrequeststart(ev);
if(pmp)xmlObj.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
ct=setTimeout(function(){ctf=true;xmlObj.abort();},AJAX.timeout);
var rc=function(){
if(ctf){AJAX.ontimeout(ev);AJAX.onrequestend(ev);}
else if(xmlObj.readyState==4){
ev.status=xmlObj.status;
try{clearTimeout(ct);}catch(e){};
try{if(xmlObj.status==200)pcbf(xmlObj);else AJAX.onexception(ev);}
catch(e){AJAX.onexception(ev);}
AJAX.onrequestend(ev);}}
xmlObj.onreadystatechange=rc;
if(pmp)xmlObj.send(pc);else xmlObj.send("");
if(pa==false)rc();
return true;}
this.setcharset=function(cs){encode=$GEC(cs);}
this.get=function(){
var p=[],av=arguments;
$GP(p,av,[this.url,this.oncomplete],[null,$CB]);
if(!p[0]&&!p[1])return false;
return(send(p[0],"",p[1],"GET",this.async));}
this.update=function(){
var p=[],purl,puo,pinv,pcnt,av=arguments;
$GP(p,av,[this.oncomplete,this.url,-1,-1],[$CB,null,$N,$N]);
if(p[2]==-1)p[3]=1;
var sf=function(){send(p[1],"",p[0],"GET",AJAX.async);};
var id=$GID();
var cf=function(cc){
sf();cc--;if(cc==0)return;
$SOP(id,setTimeout(function(){cf(cc);},p[2]));}
cf(p[3]);
return id;}
this.stopupdate=function(id){
clearTimeout($LOP(id));}
this.post=function(){
var p=[],av=arguments;
$GP(p,av,[this.url,this.content,this.oncomplete],[null,null,$CB]);
if(!p[0]&&!p[2])return false;
return(send(p[0],p[1],p[2],"POST",this.async));}
this.postf=function(){
var p=[],fo,vaf,pcbf,purl,pc,pm,ac=arguments.length,av=arguments;
fo=ac>0?$VO(av[0]):false;
if(!fo||(fo&&fo.nodeName!="FORM"))return false;
vaf=fo.getAttribute("onvalidate");
vaf=vaf?(typeof(vaf)=="string"?new Function(vaf):vaf):null;
if(vaf&&!vaf())return false;
$GP(p,[av[1],fo.getAttribute("action"),fo.getAttribute("method")],[this.oncomplete,this.url,this.method],[$CB,null,null]);
pcbf=p[0];purl=p[1];
if(!pcbf&&!purl)return false;
pc=this.formToStr(fo);if(!pc)return false;
if(p[2].toUpperCase()=="POST")
return(send(purl,pc,pcbf,"POST",true));
else{
purl+=(purl.indexOf("?")>-1?"&":"?")+pc;
return(send(purl,"",pcbf,"GET",true));}}
this.formToStr=function(fc){
var i,qs="",and="",ev="";
for(i=0;i<fc.length;i++){
e=fc[i];
if(e.name!=''){
if(e.type=='select-one'&&e.selectedIndex>-1)ev=e.options[e.selectedIndex].value;
else if(e.type=='checkbox'||e.type=='radio'){
if(e.checked==false)continue;
ev=e.value;}
else ev=e.value;
ev=encode(ev);qs+=and+e.name+'='+ev;and="&";}}
return qs;}}