Is there a way to request permission in IE to use window.external.AddFavorite?

<script type="text/javascript">
function addToFavorites() {
    if (window.sidebar) { // Mozilla uses sidebar
    	window.sidebar.addPanel( document.title, window.location , "");
    } else if (window.external) { // IE uses window.external
    	window.external.AddFavorite( window.location, document.title );
    } else { // Who knows ?  Only have to support IE & Moz anyhow.
    	alert("Sorry! Your browser doesn't support this function.");
    }
}
</script>

<a href="javascript:addToFavorites()">Bookmark This Page</a>