function getPrevMonth(argu) {
	
		argu = (typeof argu == 'undefined') ?  window.location.pathname : argu;
	
		if(current_month == 1) {
			current_month = 12;
			current_year = current_year - 1;
		}
		else {
			current_month = current_month - 1;
		}
		params = 'month='+current_month+'&year='+current_year;
		$.post(argu, { month: current_month, year: current_year },
		  function(data){
		   $('#calendar_wrapper').html(data);
		  }, "html");
	}
		
	function getNextMonth(argu) {
		argu = (typeof argu == 'undefined') ?  window.location.pathname : argu;
		
		if(current_month == 12) {
			current_month = 1;
			current_year = current_year + 1;
		} else {
			current_month = current_month + 1;
		}
		params = 'month='+current_month+'&year='+current_year;
		$.post(argu, { month: current_month, year: current_year },
		  function(data){
		   $('#calendar_wrapper').html(data);
		  }, "html");
		//new Ajax.Updater('calendar_wrapper',argu,{method:'post',parameters: params, evalScripts:true});
		
	}