[jQuery] BlockUI 1.33 $.blockUI.defaults.pageMessage is not showing the image

hi,
i´ve this:
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$().ajaxStop($.unblockUI);
function test() {
    $.ajax({ url: 'process.php?' + new Date().getTime() });
}
$(document).ready(function() {
    $('#Submit').click(function() {
        $.blockUI.defaults.pageMessage = '<h1><img src="ajax-loader.gif" />
Por favor aguarde...</h1>';
        $.extend($.blockUI.defaults.overlayCSS, { backgroundColor:
'#e9eaea' });
        $.extend($.blockUI.defaults.pageMessageCSS, { color: '#000',
backgroundColor: '#e9eaea' });
        $.blockUI();
        setTimeout($.unblockUI, 3000);
    });
});
-------------------------------------------------------------------
Everything is ok, however is NOT showing the image (<img src="ajax-
loader.gif" />), and it´s in the right place.
any ideia ?
ps - BlockUI 1.33
regards,