var courses = null;
var hours = null;
var schedule = null;
function Refresh_schedule(oSelect) {
	chObj = document.aform.schedule;
	chObj.selectedIndex = 0;
	for(var i = chObj.length - 1; i > 0; i--)
		chObj.options[i] = null;
	for(i = 0; i < schedule[oSelect.selectedIndex].length; i++) {
		chObj.options[i] = new Option(hours[schedule[oSelect.selectedIndex][i]], hours[schedule[oSelect.selectedIndex][i]]);
	}
}