var time_interval_start = null;
var time_interval_end = null;
function setTimeInterval(idx) {
	document.e3form.time_interval_start.value = "";
	document.e3form.time_interval_end.value = "";
	if (time_interval_start != null && 
		time_interval_end != null &&
		time_interval_start != time_interval_end) {
		time_interval_start = null;
		time_interval_end = null;
	}
	if (time_interval_start != null && idx > time_interval_start) {
		time_interval_end = idx;
	} else {
		time_interval_start = idx;
		time_interval_end = idx;
	}
	for (i = 0; i < 24; i++) {
		document.getElementById("ti_" + i).className = "intL";
	}
	if (time_interval_start != null && time_interval_end != null) {
		for (i = time_interval_start; i <= time_interval_end; i++) {
			document.getElementById("ti_" + i).className = "intL_on";
		}
		document.forms.e3form.time_interval_start.value = time_interval_start;
		document.forms.e3form.time_interval_end.value = time_interval_end;
		document.e3form.Interval.value = (time_interval_start)+""+ "-"+"" +(time_interval_end);
	}
	return false;
}