function checkMail(varelement) {
	new Ajax.Request('/checkmail.php',
	{
		method:'get',
		parameters: { email: $(varelement).value },
		onSuccess: function(transport){
			var response = transport.responseText;
//			var response = transport.responseText || "no response text";
			if (response != '') {
				alert(response);
				$('form_register_submit').style.display = 'none';
			} else {
				$('form_register_submit').style.display = 'block';
			}
		},
		onFailure: function(){ $('form_register_submit').style.display = 'block'; }
	});

}