Ajax ={
		_msxml_progid:[
			'MSXML2.XMLHTTP.5.0',
			'MSXML2.XMLHTTP.4.0',
			'MSXML2.XMLHTTP.3.0',
			'MSXML2.XMLHTTP',
			'Microsoft.XMLHTTP'
			]
		,_http_header:{}
		,_has_http_headers:false
		,_isFormSubmit:false
		,_sFormData:null
		,_poll:[]
		,_polling_interval:50
		,_transaction_id:0
		,setProgId:function(id){
			this.msxml_progid.unshift(id);
			}
		,setPollingInterval:function(i){
			if(typeof i == 'number' && isFinite(i)){
				this._polling_interval = i;
				}
			}
		,createXhrObject:function(transactionId){
			var obj,http;
			try{
				http = new XMLHttpRequest();
				obj = { 
					conn:http, 
					tId:transactionId 
					};
				}catch(e){
					for(var i=0; i < this._msxml_progid.length; ++i){
						try{
							http = new ActiveXObject(this._msxml_progid[i]);
							if(http){
								obj = { 
									conn:http, 
									tId:transactionId 
									};
								break;
								}
							}catch(e){}
						}
				}
				finally{
					return obj;
					}
			}
		,getConnectionObject:function(){
			var o;
			var tId = this._transaction_id;
			try{
				o = this.createXhrObject(tId);
				if(o){
					this._transaction_id++;
					}
				}catch(e){}
				finally{
					return o;
					}
			}
		,asyncRequest:function(method, uri, callback, postData){
			var o = this.getConnectionObject();
			if(!o){
				return null;
				}else{
					if(this._isFormSubmit){
						if(method == 'GET'){
							uri += "?" +  this._sFormData;
							}else if(method == 'POST'){
								postData =  this._sFormData;
								}
						this._sFormData = '';
						this._isFormSubmit = false;
					}
				o.conn.open(method, uri, true);
				if(postData){
					this.initHeader('Content-Type','application/x-www-form-urlencoded');
					}
				if(this._has_http_headers){
					this.setHeader(o);
					}
				this.handleReadyState(o, callback);
				postData?o.conn.send(postData):o.conn.send(null);
				return o;
				}
			}
		,handleReadyState:function(o, callback){
			var oConn = this;
			try{
				this._poll[o.tId] = window.setInterval(function(){
					if(o.conn && o.conn.readyState == 4){
						window.clearInterval(oConn._poll[o.tId]);
						oConn._poll.splice(o.tId);
						oConn.handleTransactionResponse(o, callback);
						}
					},this._polling_interval);
				callback.Progress(callback.argument);
				}catch(e){
					window.clearInterval(oConn._poll[o.tId]);
					oConn._poll.splice(o.tId);
					oConn.handleTransactionResponse(o, callback);
					}
			}
		,handleTransactionResponse:function(o, callback){
			if(!callback){
				this.releaseObject(o);
				return;
				}
			var httpStatus;
			var responseObject;
			try{
				httpStatus = o.conn.status;
				}catch(e){
					httpStatus = 13030;
					}
			if(httpStatus >= 200 && httpStatus < 300){
				responseObject = this.createResponseObject(o, callback.argument);
				if(callback.success){
					if(!callback.scope){
						callback.success(responseObject);
						}else{
							callback.success.apply(callback.scope, [responseObject]);
							}
					}
				}else{
					switch(httpStatus){
						case 12002:
						case 12029:
						case 12030:
						case 12031:
						case 12152:
						case 13030:
							responseObject = this.createExceptionObject(o, callback.argument);
							if(callback.failure){
								if(!callback.scope){
									callback.failure(responseObject);
									}else{
										callback.failure.apply(callback.scope,[responseObject]);
										}
								}
							break;
						default:
							responseObject = this.createResponseObject(o, callback.argument);
							if(callback.failure){
								if(!callback.scope){
									callback.failure(responseObject);
									}else{
										callback.failure.apply(callback.scope,[responseObject]);
										}
								}
						}
					}
				this.releaseObject(o);
			}
		,createResponseObject:function(o, callbackArg){
			var obj = {};
			var headerObj = {};
			try{
				var headerStr = o.conn.getAllResponseHeaders();
				var header = headerStr.split("\n");
				for(var i=0;i < header.length;i++){
					var delimitPos = header[i].indexOf(':');
					if(delimitPos != -1){
						headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+1);
						}
					}
				obj.tId = o.tId;
				obj.status = o.conn.status;
				obj.statusText = o.conn.statusText;
				obj.getResponseHeader = headerObj;
				obj.getAllResponseHeaders = headerStr;
				obj.responseText = o.conn.responseText;
				obj.responseXML = o.conn.responseXML;
				if(typeof callbackArg !== undefined){
					obj.argument = callbackArg;
					}
				}catch(e){}
				finally{
					return obj;
					}
			}
		,createExceptionObject:function(tId, callbackArg){
			var COMM_CODE = 0;
			var COMM_ERROR = 'communication failure';
			var obj = {};
			obj.tId = tId;
			obj.status = COMM_CODE;
			obj.statusText = COMM_ERROR;
			if(callbackArg){
				obj.argument = callbackArg;
				}
			return obj;
			}
		,initHeader:function(label,value){
			if(this._http_header[label] === undefined){
				this._http_header[label] = value;
				}else{
					this._http_header[label] =  value + "," + this._http_header[label];
					}
			this._has_http_headers = true;
			}
		,setHeader:function(o){
			for(var prop in this._http_header){
				o.conn.setRequestHeader(prop, this._http_header[prop]);
				}
			delete this._http_header;
			this._http_header = {};
			this._has_http_headers = false;
			}
		,setForm:function(formId){
			this._sFormData = '';
			if(typeof formId == 'string'){
				var oForm = (document.getElementById(formId) || document.forms[formId] );
				}else if(typeof formId == 'object'){
					var oForm = formId;
					}else{
						return;
						}
			var oElement, oName, oValue, oDisabled;
			var hasSubmit = false;
			for (var i=0; i<oForm.elements.length; i++){
				oDisabled = oForm.elements[i].disabled;
				if(oForm.elements[i].name != ""){
					oElement = oForm.elements[i];
					oName = oForm.elements[i].name;
					oValue = oForm.elements[i].value;
					}
				if(!oDisabled){
					switch (oElement.type){
						case 'select-one':
						case 'select-multiple':
							for(var j=0; j<oElement.options.length; j++){
								if(oElement.options[j].selected){
									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].value || oElement.options[j].text) + '&';
									}
								}
								break;
						case 'radio':
						case 'checkbox':
							if(oElement.checked){
								this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
								}
							break;
						case 'file':
						case undefined:
						case 'reset':
						case 'button':
							break;
						case 'submit':
							if(hasSubmit == false){
								this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
								hasSubmit = true;
								}
							break;
						default:
							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
							break;
							}
						}
					}
				this._isFormSubmit = true;
				this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
			}
		,abort:function(o){
			if(this.isCallInProgress(o)){
				window.clearInterval(this._poll[o.tId]);
				this._poll.splice(o.tId);
				o.conn.abort();
				this.releaseObject(o);
				return true;
				}else{
					return false;
					}
			}
		,isCallInProgress:function(o){
			if(o.conn){
				return o.conn.readyState != 4 && o.conn.readyState != 0;
				}else{
					return false;
					}
			}
		,releaseObject:function(o){
			o.conn = null;
			o = null;
			}

		};