function ajax() {

};

ajax.prototype.iniciar = function() {

	try{
		this.xmlhttp = new XMLHttpRequest();
	}

	catch(ee){

		try{
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		}

		catch(e){

			try{
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			}

			catch(E){
				this.xmlhttp = false;
			}

		}

	}

	return true;

}

ajax.prototype.ocupado = function() {

	estadoAtual = this.xmlhttp.readyState;
	return (estadoAtual && (estadoAtual < 4));

}

ajax.prototype.processa = function(){

	if (this.xmlhttp.readyState == 4 && this.xmlhttp.status == 200){
		return true;
	}
}

ajax.prototype.enviar = function(url, metodo, modo){

	if (!this.xmlhttp){
        this.iniciar();
	}
	if (!this.ocupado()) {

		if(metodo == "GET") {

			this.xmlhttp.open("GET", url, modo);
			this.xmlhttp.send(null);

		} else {

			this.xmlhttp.open("POST", url, modo);
			this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
			this.xmlhttp.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");
			this.xmlhttp.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");
			this.xmlhttp.setRequestHeader("Pragma", "no-cache");
			this.xmlhttp.send(url);

		}

		if (this.processa) {

			return unescape(this.xmlhttp.responseText.replace(/\+/g," "));

		}

	}

	return false;

}