function isDate(dateStr,showAlert) {
	
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
	var matchArray = dateStr.match(datePat); // is the format ok?
	
	if (matchArray == null) {
		if(showAlert){
			alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");
		}
		return false;
	}
	
	month = matchArray[1]; // p@rse date into variables
	day = matchArray[3];
	year = matchArray[5];
	
	if (month < 1 || month > 12) { // check month range
		if(showAlert){
			alert("Month must be between 1 and 12.");
		}
		return false;
	}
	
	if (day < 1 || day > 31) {
		if(showAlert){
			alert("Day must be between 1 and 31.");
		}
		return false;
	}
	
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		if(showAlert){
			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)) {
			if(showAlert){
				alert("February " + year + " doesn`t have " + day + " days!");
			}
			return false;
		}
	}
	return true; // date is valid
}

function isEmail(str){
	if(str.indexOf("@") < 0 || str.indexOf(".") < 0){
		return false;
	}
	
	return true;
}