JQuery :: Change Cursor Style In IE To Not-Allowed On Overlay?

I have a DIV blocked from data entry in IE, Firefox, Safari and Opera. Functionally all is okay -- super plugin! The only problem left is that the cursor does not change to 'not-allowed' on the overlay when I use IE 6,7 or 8. All other browsers render the cursor okay?

Here's the code:
$().ready(function() {
Protect('#divData');
$('#cbProtected').bind('click', function(e, ui) {
if ($(this).is(':checked'))
Protect('#divData');
else
Unprotect('#divData');
});
});
function Protect(el) {
$(el).block({
message: null,
overlayCSS: {
backgroundColor: null,
opacity: 1.0,
cursor: 'not-allowed'
}});};
function Unprotect(el) {
$(el).unblock();
};