$(document).ready(function () {
    $('#signin').submit(function () {
		    if ($('#uname').val() == '') {
				    alert('The user name must be filled.');
						$('#uname').focus();
						return false;
				}
				if ($('#upass').val() == '') {
				    alert('The password must be filled.');
						$('#upass').focus();
						return false;
				}
		});
});