/* From: http://marketingtechblog.com/programming/javascript-regex-emailaddress/ */
function isValidEmail(email) {	
	var filter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email)) {			
		return false;
	}
	
	return true;
}