how can i add second or more child in this code?

how can i add second or more child in this code?

how can i add more childs..?? as first child contains effect only if i
wrote a text in any other div under the first child div it got
disapeared...:( ;(function ( $, window, document, undefined ) {
var pluginName = "tabulous",
defaults = {
effect: 'scale'
};
// $('<style>body { background-color: red; color: white;
}</style>').appendTo('head');
function Plugin( element, options ) {
this.element = element;
this.$elem = $(this.element);
this.options = $.extend( {}, defaults, options );
this._defaults = defaults;
this._name = pluginName;
this.init();
}
Plugin.prototype = {
init: function() {
var links = this.$elem.find('a');
var firstchild = this.$elem.find('li:first-child').find('a');
var lastchild = this.$elem.find('li:last-child').after('<span
class="tabulousclear"></span>');
if (this.options.effect == 'scale') {
tab_content =
this.$elem.find('div').not(':first').not(':nth-child(1)').addClass('hidescale');
} else if (this.options.effect == 'slideLeft') {
tab_content =
this.$elem.find('div').not(':first').not(':nth-child(1)').addClass('hideleft');
}
var firstdiv = this.$elem.find('#tabs_container');
var firstdivheight = firstdiv.find('div:first').height();
var alldivs = this.$elem.find('div:first').find('div');
alldivs.css({'position': 'absolute','top':'0px'});
firstdiv.css('height',firstdivheight+'px');
firstchild.addClass('tabulous_active');
links.bind('click', {myOptions: this.options}, function(e) {
e.preventDefault();
var $options = e.data.myOptions;
var effect = $options.effect;
var mythis = $(this);
var thisform = mythis.parent().parent().parent();
var thislink = mythis.attr('href');
firstdiv.addClass('transition');
links.removeClass('tabulous_active');
mythis.addClass('tabulous_active');
thisdivwidth = thisform.find('div'+thislink).height();
if (effect == 'scale') {
alldivs.removeClass('showscale').addClass('make_transist').addClass('hidescale');
thisform.find('div'+thislink).addClass('make_transist').addClass('showscale');
}
firstdiv.css('height',thisdivwidth+'px');
});
},
yourOtherFunction: function(el, options) {
// some logic
}
};
// A really lightweight plugin wrapper around the constructor,
// preventing against multiple instantiations
$.fn[pluginName] = function ( options ) {
return this.each(function () {
new Plugin( this, options );
});
};
})( jQuery, window, document );