function Valid_Date(dateStr) {
	// Checks for the following valid date formats:
	// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
	// Also separates date into month, day, and year variables

	//var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

	// To require a 4 digit year entry, use this line instead:
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

	var matchArray = dateStr.match(datePat); // is the format ok?
	if (matchArray == null) {
		alert("Date is not in a valid format.")
		return 0;
	}

	month = matchArray[1]; // parse date into variables
	day = matchArray[3];
	year = matchArray[4];
	if (month < 1 || month > 12) { // check month range
		alert("Month must be between 1 and 12.");
		return 0;
	}

	if (day < 1 || day > 31) {
		alert("Day must be between 1 and 31.");
		return 0;
	}

	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		alert("Month "+month+" doesn't have 31 days!")
		return 0
	}

	if (month == 2) { // check for february 29th
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day>29 || (day==29 && !isleap)) {
			alert("February " + year + " doesn't have " + day + " days!");
			return 0;
		}
	}
	return -1;  // date is valid
}

function listpopup(cats) {
	var x; var y;
	x = 100; y = 100;
	var url = "list_cals.asp?CalendarCats="+cats
	alert (url)
	popWin=window.open(url,"list_cals","height=500,width=350,scrollbars=yes,titlebar=no,resizable,screenX="+x+",left="+x+",screenY="+y+",top="+y);
}

function listFile() {
	var x; var y;
	x = 200; y = 350;
	if (window.document.findform.event_id.value=="") {
	//alert("Attachments can only be added to events after saving.");
	return Validate();
	}
	if (window.document.findform.event_id.value!= "") {
	var url = "/events/events_admin/EventsUploadForm.asp" +	"?event_id=" + window.document.findform.event_id.value;
	popWin=window.open(url,"EventsUploadForm","height=350,width=450,scrollbars=yes,titlebar=no,noresize,screenX="+x+",left="+x+",screenY="+y+",top="+y);
}
}