function showCalendar() {	
	var offsets = document.viewport.getScrollOffsets();	
	var over_width = $$('body')[0].offsetWidth;	
	var left = ((over_width - 682) / 2);
	var top = 30 + offsets.top;
	
	var height = $$('body')[0].offsetHeight;
	
	$$('body')[0].insert({top: '<div id="overlay" style="left:0;height:'+height+'px;width:'+over_width+'px;"></div><div id="calendar-box" style="left:'+left+'px;top:'+top+'px;"><div id="calendar"></div></div>'});
	swfobject.embedSWF("calendar.swf", "calendar", "682", "480", "8.0.0", false, {}, {wmode:"transparent"}, {});	
	
	$('overlay').onclick = hideCalendar;
}

function hideCalendar() {
	$('overlay').remove();
	$('calendar-box').remove();
}