function toggleCalendar(a, month, year){
	$('c'+month+year).toggle();
	
	if($('c'+month+year).visible() ){
		$(a).innerHTML=month+' <img src="/lib/icons/down_arrow.gif" alt="" width="10" height="6" />';
	}else{
	$(a).innerHTML=month+' <img src="/lib/icons/right_arrow.gif" alt="" width="6" height="11" />';
	}

}