function showDropdown( elem, elem_name ) {
    if( !elem_name ) { return; }
    elem_name = "#" + elem_name;
    var names = [ 'container1', 'container2', 'container3', 'container4', 'container5', 'container6', 'container7', 'container8', 'container9', 'container10' ];
    for( var i = 0; i < names.length; i++ ) {
      var name = "#" + names[i];
      if( ( name == elem_name ) && ( $(name).css( 'display' ) == 'none' ) ) {
        $('.'+names[i]+'-control').hide();
        $('.'+names[i]+'-control').css( 'z-index', 102 );
        $('.'+names[i]+'-control').show();
        $(name).show();

        //$(name).find('.'+names[i]+'-space').width( $(elem).width() );
        //$(name).find('.'+names[i]+'-space').height( $(elem).height() );

        $(name).css('top', $(name).offset().top - ( $(name).find('.'+names[i]+'-space').offset().top - $(elem).offset().top ) );
        $(name).css('left', $(name).offset().left - ( $(name).find('.'+names[i]+'-space').offset().left - $(elem).offset().left ) );

        //$("#containerDropdown").fadeIn("slow");
        $(name+"-iframe").width( $(name).width() );
        $(name+"-iframe").height( $(name).height() );
      } else {
        $('.'+names[i]+'-control').hide();
        $('.'+names[i]+'-control').css( 'z-index', 0 );
        $('.'+names[i]+'-control').show();
        $(name).hide();
        //$("#containerDropdown").fadeOut("slow");
        $(name+"-iframe").width( 0 );
        $(name+"-iframe").height( 0 );
      }
    }
  }