// JavaScript Document
   addCalendar("search_start", "Begin", "START_DATE", "searchEvent"); 
   addCalendar("search_end", "End", "END_DATE", "searchEvent"); 
   function validate(thisform){
		
		var searchEvent = thisform;
		var startDate=trim(eval("document."+searchEvent+".START_DATE").value);
		if (startDate.length >0 && !isValidDate(startDate)){
			document.searchEvent.START_DATE.focus();
			return false;
		}
		
		var endDate=trim(eval("document."+searchEvent+".END_DATE").value);
		
		if (endDate.toLowerCase() == "end date"){
			
			endDate="";
		}
		
		if (endDate.length >0 &&!isValidDate(endDate)){
			eval("document."+searchEvent+".END_DATE").focus();
			return false;
		}
		if (startDate.length >0 && endDate.length >0 &&!dateDiff("searchEvent", startDate, endDate)){
			return false;
		}
		return true;
   }
   function trim(str) {
		var re = /^\s+(.*?)\s+$/;
		return str.replace(re,"$1");
	} 
   function isValidDate(dateStr) {
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/; // requires 4 digit year
	var matchArray = dateStr.match(datePat); // is the format ok?
	
	if (matchArray == null) {
		alert(dateStr + " is not in a valid format.  Enter date in mm/dd/yyyy format")
		return false;
	}
	
	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 false;
	}
	if (day < 1 || day > 31) {
		alert("Day must be between 1 and 31.");
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		alert("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)) {
			alert("February " + year + " doesn't have " + day + " days!");
			return false;
		}
	}
	return true;
}

function dateDiff(dateform, strDate1, strDate2) {
	date1 = new Date();
	date2 = new Date();
	diff  = new Date();
	var time="12:00:00AM";
	
	date1temp = new Date(strDate1 + " " + time);
	date1.setTime(date1temp.getTime());

	date2temp = new Date(strDate2 + " " + time);
	date2.setTime(date2temp.getTime());
	
	// sets difference date to difference of first date and second date
	diff.setTime(date1.getTime() - date2.getTime());
	timediff = diff.getTime();
	
	days = Math.floor(timediff / (1000 * 60 * 60 * 24)); 
	timediff -= days * (1000 * 60 * 60 * 24);
	//alert("days difference: " + days);

	if (days > 0) {
		alert("End date should be later than Start date.  Please enter the date again.");
		return false;
	}
	return true;
}