function sack(file)
{this.AjaxFailedAlert="Trình duyệt của bạn không hỗ trợ Load Ajax. Bạn nên chọn một trình duyệt khác để sử dụng được tất cả chức năng của hệ thống.\n";this.requestFile=file;this.method="POST";this.URLString="";this.encodeURIString=true;this.execute=false;this.onLoading=function(){};this.onLoaded=function(){};this.onInteractive=function(){};this.onCompletion=function(){};this.createAJAX=function()
{try
{this.xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");}
catch(e)
{try
{this.xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}
catch(err)
{this.xmlhttp=null;}}
if(!this.xmlhttp&&typeof XMLHttpRequest!="undefined")
this.xmlhttp=new XMLHttpRequest();if(!this.xmlhttp)
{this.failed=true;}};this.setVar=function(name,value)
{if(this.URLString.length<3){this.URLString=name+"="+value;}else{this.URLString+="&"+name+"="+value;}}
this.encVar=function(name,value)
{var varString=encodeURIComponent(name)+"="+encodeURIComponent(value);return varString;}
this.encodeURLString=function(string)
{varArray=string.split('&');for(i=0;i<varArray.length;i++)
{urlVars=varArray[i].split('=');if(urlVars[0].indexOf('amp;')!=-1)
{urlVars[0]=urlVars[0].substring(4);}
varArray[i]=this.encVar(urlVars[0],urlVars[1]);}
return varArray.join('&');}
this.runResponse=function()
{eval(this.response);}
this.runAJAX=function(urlstring)
{this.responseStatus=new Array(2);if(this.failed&&this.AjaxFailedAlert)
{alert(this.AjaxFailedAlert);}
else
{if(urlstring)
{if(this.URLString.length)
{this.URLString=this.URLString+"&"+urlstring;}
else
{this.URLString=urlstring;}}
if(this.encodeURIString)
{var timeval=new Date().getTime();this.URLString=this.encodeURLString(this.URLString);this.setVar("rndval",timeval);}
if(this.element)
{this.elementObj=document.getElementById(this.element);}
if(this.xmlhttp)
{var self=this;if(this.method=="GET")
{var totalurlstring=this.requestFile+"?"+this.URLString;this.xmlhttp.open(this.method,totalurlstring,true);}
else
{this.xmlhttp.open(this.method,this.requestFile,true);}
if(this.method=="POST")
{try
{this.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded')}
catch(e){}}
this.xmlhttp.send(this.URLString);this.xmlhttp.onreadystatechange=function()
{switch(self.xmlhttp.readyState)
{case 1:self.onLoading();break;case 2:self.onLoaded();break;case 3:self.onInteractive();break;case 4:self.response=self.xmlhttp.responseText;self.responseXML=self.xmlhttp.responseXML;self.responseStatus[0]=self.xmlhttp.status;self.responseStatus[1]=self.xmlhttp.statusText;self.onCompletion();if(self.execute)
{self.runResponse();}
if(self.elementObj)
{var elemNodeName=self.elementObj.nodeName;elemNodeName.toLowerCase();if(elemNodeName=="input"||elemNodeName=="select"||elemNodeName=="option"||elemNodeName=="textarea")
{self.elementObj.value=self.response;}
else
{self.elementObj.innerHTML=self.response;}}
self.URLString="";break;}};}}};this.createAJAX();}