function clsAjax(){
this.ajax;
this.url;
this.method;
this.param;
this.responseText;
this.function_name;

//Create Ajax Object
this.create = function(){
this.param = new Array();
if(window.ActiveXObject){
this.ajax = new ActiveXObject("Microsoft.XMLHTTP");
}else{
this.ajax = new XMLHttpRequest();
}
}

this.addParam = function(name, value){
this.param.push(name+"="+encodeURI(value));
}

this.createParameters = function(){
var q = "";
if(this.param.length > 0){
for(i=0; i<this.param.length; i++){
q += this.param[i]+"&";
}
q = q.substr(0, q.length-1);
}
return q;
}

//Send data
this.send = function(){
var tempurl = this.url;
var querystring = this.createParameters();
if(this.method.toLowerCase() == "get"){
tempurl += "?"+querystring;
}
this.ajax.onreadystatechange = this.stateChange; 
this.ajax.open(this.method, tempurl, true);
if(this.method.toLowerCase()=="post"){
this.ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=tis-620');
this.ajax.send(querystring);
}else{
this.ajax.send(null);
}
}

//Check state change and retrieve data.
var self = this;
this.stateChange = function(){
if(self.ajax!=null){
if(self.ajax.readyState == 4){ 
if(self.ajax.status == 200){
self.responseText = self.ajax.responseText;
if(self.function_name != ""){ 
eval(self.function_name);
}
}
}
}else{
alert("Ajax object not set.");
}
}
}