// <!-- Original:  Ronnie T. Moore -->
	// <!-- Web Site:  The JavaScript Source -->
	
	// <!-- This script and many more are available free online at -->
	// <!-- The JavaScript Source!! http://javascript.internet.com -->
	
	// <!-- Begin
	function isValidDate(dateStr) {
		// Date validation function courtesty of 
		// Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
		
		// Checks for the following valid date formats:
		// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
		
		var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/; // requires 4 digit year
		
		var matchArray = dateStr.match(datePat); // is the format ok?
		if (matchArray == null) {
			$.fancybox(dateStr + " Date is not in a valid format.")
			return false;
		}
		month = matchArray[1]; // parse date into variables
		day = matchArray[3];
		year = matchArray[4];
		if (month < 1 || month > 12) { // check month range
			$.fancybox("Month must be between 1 and 12.");
			return false;
		}
		if (day < 1 || day > 31) {
			$.fancybox("Day must be between 1 and 31.");
			return false;
		}
		if ((month==4 || month==6 || month==9 || month==11) && day==31) {
			$.fancybox("Month "+month+" doesn't have 31 days!")
			return false;
		}
		if (month == 2) { // check for february 29th
			var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
			if (day>29 || (day==29 && !isleap)) {
				$.fancybox("February " + year + " doesn't have " + day + " days!");
				return false;
		   }
		}
		return true;
	}
	
	function isValidTime(timeStr) {
		// Time validation function courtesty of 
		// Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
		
		// Checks if time is in HH:MM:SS AM/PM format.
		// The seconds and AM/PM are optional.
		
		var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
		
		var matchArray = timeStr.match(timePat);
		if (matchArray == null) {
			$.fancybox("Time is not in a valid format.");
			return false;
		}
		hour = matchArray[1];
		minute = matchArray[2];
		second = matchArray[4];
		ampm = matchArray[6];
		
		if (second=="") { second = null; }
		if (ampm=="") { ampm = null }
		
		if (hour < 0  || hour > 23) {
			$.fancybox("Hour must be between 1 and 12. (or 0 and 23 for military time)");
			return false;
		}
		if (hour <= 12 && ampm == null) {
			/*
			if (confirm("Please indicate which time format you are using.  OK = Standard Time, CANCEL = Military Time")) {
				$.fancybox("You must specify AM or PM.");
				return false;
		    }
		    */
		}
		if  (hour > 12 && ampm != null) {
			$.fancybox("You can't specify AM or PM for military time.");
			return false;
		}
		if (minute < 0 || minute > 59) {
			alert ("Minute must be between 0 and 59.");
			return false;
		}
		if (second != null && (second < 0 || second > 59)) {
			alert ("Second must be between 0 and 59.");
			return false;
		}
		return true;
	}
	
	var weeks = 0;
	var days = 0;
	var hours = 0;
	var mins = 0;
	var secs = 0;
	var msecs = 0;
	function dateDiff(firstdate, firsttime, seconddate, secondtime) {
		date1 = new Date();
		date2 = new Date();
		diff  = new Date();
		
		if (isValidDate(firstdate) && isValidTime(firsttime)) { // Validates first date 
			date1temp = new Date(firstdate + " " + firsttime);
			date1.setTime(date1temp.getTime());
		}
		else return false; // otherwise exits
		
		if (isValidDate(seconddate) && isValidTime(secondtime)) { // Validates second date 
			date2temp = new Date(seconddate + " " + secondtime);
			date2.setTime(date2temp.getTime());
		}
		else return false; // otherwise exits
		
		// sets difference date to difference of first date and second date
		
		diff.setTime(Math.abs(date1.getTime() - date2.getTime()));
		
		timediff = diff.getTime();
		
		weeks = Math.floor(timediff / (1000 * 60 * 60 * 24 * 7));
		timediff -= weeks * (1000 * 60 * 60 * 24 * 7);
		
		days = Math.floor(timediff / (1000 * 60 * 60 * 24)); 
		timediff -= days * (1000 * 60 * 60 * 24);
		
		hours = Math.floor(timediff / (1000 * 60 * 60)); 
		timediff -= hours * (1000 * 60 * 60);
		
		mins = Math.floor(timediff / (1000 * 60)); 
		timediff -= mins * (1000 * 60);
		
		secs = Math.floor(timediff / 1000); 
		timediff -= secs * 1000;
		
		// dateform.difference.value = weeks + " weeks, " + days + " days, " + hours + " hours, " + mins + " minutes, and " + secs + " seconds";
		
		return false; // form should never submit, returns false
	}
	//  End -->