function show_popup() { 
   if ($('#windowContainer').length == 0) {
        var windowContainer = "<div id='windowContainer' style='display:none;'></div>";
        $("body").append(windowContainer);
      }
    $('#windowContainer').modal( {
        position : [ 20, ],
        containerCss : {
          height : 550,
          width : 410,
          backgroundColor : '#282828',
          border : '1px solid #ccc'
        },
        onOpen : function(dialog) {
          dialog.overlay.fadeIn('slow', function() {
            dialog.container.slideDown('slow', function() {
              dialog.data.fadeIn('slow');
              $('#windowContainer').html("<img src='./themes/termal_new/images/banner.png' />");
            });
          });
        },
        onClose : function(dialog) {
          dialog.data.fadeOut('slow', function() {
            dialog.container.slideUp('slow', function() {
              dialog.overlay.fadeOut('slow', function() {
                $('#windowContainer').hide();
                $('#windowContainer').remove();
                $.modal.close(); // must call this!
              });
            });
          });
        }
      });


}