function checkform()
{
	var email = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

	if ($("#name").val() == "" ||
		$("#email").val() == "" ||
		$("#birthday").val() == "" ||
		$("#place").val() == "" ||
		email.test($("#email").val()) == false)
	{
		alert("Please fill in your name, e-mail address, birthday and City!");	
		return false;
	}
	else
	{
		return true;
	}
}