varPool_xmlreq=function(){
var_cacheCase=[];
_cacheCase.fetch=function(){
vari=0;
var_instance=function(){
try{
return(newActiveXObject("Msxml2.XMLHTTP.5.0"));}
catch(e){
try{
return(newXMLHttpRequest());}
catch(e){
try{
return(newActiveXObject("Msxml2.XMLHTTP"));}
catch(e){
try{
return(newActiveXObject("Microsoft.XMLHTTP"));}
catch(e){
alert("Error:initializingxmlhttprequest!");}}}}}
for(;i<this.length;i++){
if(this[i].readyState==0||this[i].readyState==4){
returnthis[i];}}
this[i]=_instance();
returnthis[i];}
this.length=function(){
return_cacheCase.length}
this.instance=function(){
return_cacheCase.fetch()}
this.connect=function(method,url,data,handler){
var_xmlhttpreq=_cacheCase.fetch();
with(_xmlhttpreq){
open(method,url,true);
setRequestHeader("Cache-Control","no-cache");
setRequestHeader("Content-Type","application/x-ponent(_xmlhttpreq.responseText));
returntrue;}
alert("Error:status_"+_xmlhttpreq.status+"!");
returnfalse;}}}
}
varxmlreq=newPool_xmlreq();

用法:
xmlreq.connect("post",url,postdata,function);