Inconsistent Results between Firefox and IE using DatePicker

Inconsistent Results between Firefox and IE using DatePicker


I have a page with a datepicker input. Just below the datepicker is a
flash object. In IE, the datepicker comes up just fine, on top of the
flash object. However, in Firefox, the datepicker comes up under the
flash object, making it impossible to select a date.
In the datepicker.css file, I have set the z-index above anything else
on the page...
#ui-datepicker-div {
    display: none;
    border: 1px solid #217bc0; /* Border around the date picker */
    z-index: 9999; /*must have*/
}
Any ideas why it comes up under the flash object in Firefox and how I
can correct this?
Thanks for any help...