[jQuery] plugin: blockui - How to 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();
};