var req = createXMLHttpRequest();		
		function createXMLHttpRequest() {
		 var ua;
		 if(window.XMLHttpRequest) {
			 try {
			  ua = new XMLHttpRequest();
			 } catch(e) {
			  ua = false;
			 }
		 }else if(window.ActiveXObject) {
				try {
				ua = new ActiveXObject("Microsoft.XMLHTTP");
			  } catch(e) {
				ua = false;
			  }
		 }
		 return ua;
		}
		
	function calendarioFuncion(accion, mes, ano, idx){
		if (accion=="adelante"){
					if(mes==12){
						mes=1;
						ano=ano+1;
					}else{
						mes=mes+1;	
					}
			}
			if (accion=="atras"){
			
					if(mes==1){
						mes=12;
						ano=ano-1;
					}else{
						mes=mes-1;	
					}
			}
				
		 var rnd982g = Math.random();
		 filen='js/calendario_eng.php?mes=';
		 		  req.open('GET', filen + mes +'&ano='+ano+'&idroom='+idx+ '&rnd982g=' + rnd982g);
		 // req.open('GET','js/calendario.php?mes=' + mes +'&ano='+ano,+'&idx='+idx'&rnd982g=' + rnd982g);
		  req.onreadystatechange = handleHttpResponseCalendario;
		  req.send('');
		
		
						
	}		
	
 	function handleHttpResponseCalendario() {
		if (req.readyState == 4) {
			 var response = req.responseText;
			document.getElementById('tabla_calendario').innerHTML=response;
					return false;
	}
}