function next_month(m,y){
	document.getElementById('calendar').innerHTML='<center><img src=/ajax-loader.gif></center>';
	JsHttpRequest.query('/ajax.calendar.php', 
			{
	 		'month' : m,
			 'year' : y
			 }, 
		 	function(result, errors) {
			document.getElementById('calendar').innerHTML=result["_calendar"];
			 } 
		,true);
}