Use lightbox to tell user page is loading

Hey,

I have a form which when submitted uses a $.get(script, {}, gotoSite) query, which runs a python script and then redirects to the required page. The script takes approximately 30 seconds to run, so during this time i want to use a lightbox to tell the user that the page is loading.

 I had a look at jquery's lighbox, but couldnt see how i could implement it.
At the moment i load a 'laoding' html page at the same time as the $.get() function, then i close that page when the gotoSite() function is reached.

View bellow code:

<script>
    url = "cgi-bin/script.py?";
    function submitUsingGet()
    {
        ....
        $.get(url, {}, gotoSite);
        createWindow();   // This is where i load the html 'loading page'
    }
 
    function gotoSite()
    {
        window.location = "page.htm";
        closeBar();   // This is where i close the 'loading page'
    }
</script>

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