// make the specified div a windowed control in IE6
     // this masks an iframe (which is a windowed control) onto the div,
     // turning the div into a windowed control itself
     function makeWindowed(p_div)
     {
        var is_ie6 =
           document.all && 
           (navigator.userAgent.toLowerCase().indexOf("msie 6.") != -1);
        if (is_ie6)
        {
           var html =
              "<iframe style=\"position: absolute; display: block; " +
              "z-index: -1; width: 100%; height: 100%; top: 0; left: 0;" +
              "filter: mask(); background-color: #ffffff; \"></iframe>";
           if (p_div) p_div.innerHTML += html;
           // force refresh of div
           var olddisplay = p_div.style.display;
           p_div.style.display = 'none';
           p_div.style.display = olddisplay;
        };
     }