function do_signup(){
	
	if( isValidEmailAddress($("#signup").val()) ){
				
		$.post(
			"/signup.php",
			{ signup: $("#signup").val() },
			function(data){
				$("#signup_fail").hide();
				$("#signup_success").show();
				$("#signup_form").html("");
			}
		);
	}
	else{
		$("#signup_fail").show();
	}
	return false;
}

function isValidEmailAddress(emailAddress) {
	var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
	return pattern.test(emailAddress);
}