The modal should open immediately so im not sure why you would even need one.
Because I will open an iframe within the modal, so it would be interesting to show a loading image until the iframe is ready. So, the modal will open only when the iframe is loaded.
You can add it to the background of the overlay using css.
.modal-overlay { background-image:url(path/to/image.gif); background-position:center center; }
You may need to use !important in your css rules.
Hope this helps,
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I tried this code, but nothing worked. =/
what was the code you used?