function hide_popup() {
      for (i = 1; i < 100 ; i++) { setTimeout("set_op('popup',"+(100-i)+")", (i*3)); }
      i = i + 1;
      setTimeout("document.getElementById('popup').style.display = 'none'", (i*3));
    }

    function set_op(id, val) {
        document.getElementById(id).style.opacity = val/100;
        document.getElementById(id).style.MoZOpacity = val/100;
        document.getElementById(id).style.filter = 'alpha(opacity='+val+')';
    }

    function show_popup_timer() {
        setTimeout("show_popup()", 1000);
    }
    function show_popup() {
    document.getElementById('popup').style.display = 'block';
      for (i = 1; i < 100 ; i++) { setTimeout("set_op('popup',"+i+")", (i*3)); }
    }

    function disp_popup() {
        document.getElementById('popup').style.display = 'block';
    }