How to handle lengthy data-intensive operations in a web app?

Hello,
I have a highly data-intensive application which has to be kick-started from a web page (which could take anywhere between 15-20 mnts even with threads and optimizations). Usually, I prefer having these as cronjobs but this one needs to be under the user's control. I was thinking of submitting the job and sending a response back with some message like "This may take 15-20 minutes. Please check back later to see the status." etc..but I would like to have some sort of notification to the user once it is finished (no mails etc.) instead of the user checking back everytime. Can anybody suggest a good solution for this?
Thanks in advance!

There's also a Javascript standard function called init() , called on the HTML body tag ,
for example <body onload="init()"> , and the function gets called as soon as the HTML DOM finishes loading.
I've come accross Javascript code that displays a DIV tag that is tall, and displays a message like "Please wait until this page finishes loading" - and as soon as the page finishes loading the DIV tag is hidden, thus revealing the rest of the page, that was at the bottom of the tall div tag.
This will only work for the entire duration of the page, and can't poll the wait with a given frequency. I don't think it can estimate how long it will take for the page to load.
    <div class="loading" id="please_wait_loading" >
    <span style="font-size:xx-large;font-family:'Comic Sans MS'">Loading your request. Please Wait!</span>
    <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
    <span style="font-size:large;"><a href="#startcontent" style="text-decoration:underline">skip this screen</a></span><br/>
    </div>
<script type="text/javascript">
    var ld;
    ld = document.getElementById("please_wait_loading").style;
    function init()
        ld.visibility = "hidden";
        ld.display = "none";
</script>

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