function checkMail()
{
	var message="Please wait";
	if(document.getElementById('submit-mailinglist').value==message)
		return false;
	
	if(document.getElementById('mail').value.search(/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z]{2,})+$/)==-1)
	{
		alert("Error : Unvalid email. Please retry.");
		document.getElementById('mail').focus();
		return false;
	}
	else
	{
		document.getElementById('submit-mailinglist').value=message;
		return true;
	}
}