var popupcalendar, calendar1, calendar2, /*must be declared in global scope*/
/*put the calendar initializations in the window's onload() method*/
window.onload = function() {
var popupcalendar = new Epoch('cal','popup',document.getElementById('popup_container'),false);
	var calendar1 = new Epoch('geb','popup',document.getElementById('geb_container'),false);
	var calendar2 = new Epoch('gebp','popup',document.getElementById('gebp_container'),false);
	
	
	...
}