SinaWeiBo.WebService1.cunzai($(this).val(), a, b)
{
function a(result) {
if (result == "The email already exists, please re-enter") {
$('#txtusername').val('');
$('#txtusername').focus();
$('#mailyz').text(result);
}
else { $('#emailz').text('can be used'); }
}
function b() {
$('#emailz').text( 'No return value');
}
}