$(document).ready(function() {
	$("form").submit(
		function() {
			var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
			
			if ($('#first_name').val().length<1 || $('#last_name').val().length<1 || $('#email').val().length<1 || !$('#email').val().match(emailRegEx)) {
				alert('Please enter your First Name, Last Name and Email');
				return false;
				}

			})
    });