Websecurity and End-user-notification with HTTPS proxy

Question

Hi all
I would like to setup HTTPS-proxy functionality in a deployment. Most of the rules are "pass-through" and only a few would then be configured for drop or decryption.
But if i set the connection to drop it is not possible to display an End-user-notification for the endusers. Is there any chance to display an End-user notification to the enduser while dropping or denying https access to a particular group ?
If yes, is the End-user notification then displayed in normal http connection or in a https connection ?
Did i use for that a trusted certificate to correctly display the end-user notification without to pop-up a certificate failure (because self-signed certificate is in place at the moment) ?
It would be great, if you have some answers for some of those questions.

Answer 1

Andrew,
  See if the below may be modified to do what you want.
barbee.
Cisco Ironport Advanced Services
     * This function checks for the category and redirects the user.
     *  -- 2010 june 16. barbee.
    function checkForRedirect() {
        var category = document.getElementById("category");
        if ( category.value == "Search Engines" ) {
            window.location = 'http://www.ironport.com';
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