function Ajax(Parametros,NombrePrograma){
	if(window.XMLHttpRequest) {
		xmlhttp = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
	} else {

		return true;
	}
	xmlhttp.open('POST',NombrePrograma, true);
	xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded'); // sending it as encoded formdata
	xmlhttp.setRequestHeader('Content-length',Parametros.length); // we need to specify the length of the contents
	xmlhttp.setRequestHeader('Connection','close'); // Connection is to be closed after transfer
	
	xmlhttp.send(Parametros); 	
	return xmlhttp;
};