function get_mac_info(serial_number) {
		
		$('errors').set('html','');
		if (serial_number == '' || serial_number == null) {
			$('errors').set('html','Debe ingresar el número de serie.');
			return;
		}
			
		var req = new Request.JSON({	
						url: 'get_mac_info.php?sn='+serial_number,
						urlEncoded : false,
						onComplete :  function(object){
									  var sn = serial_number;
									  
									  if (object != null) {
									  	
									  	$('model').set('value',object.model);
									  	if (object.warranty_coverage == null || object.warranty_coverage == '') {
									  		object.warranty_coverage = "Fuera de Garantía";
									  	}
									  	$('warranty_coverage').set('value',object.warranty_coverage);
									  	
									  } else {
									  	$('errors').set('html','Hubo un error al obtener el número de serie.');	
									  }
									  },
						headers : {
									 "Content-Type" : "application/json; charset=ISO-8859-1;"
							 	  },
						onFailure : function(object){
									},
						onException : function(object){
									  }
									});
		req.send();

};