<script src="http://code.jquery.com/jquery-1.4.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
var interval;
        $(function()
{
    interval=setInterval("updateActiveElement();", 50);
});

function updateActiveElement()
{
    if ( $(document.activeElement).attr('id')=="fbframe" )
    {
        clearInterval(interval);
        iflag=1;
    }
}

</script>