Help with getting started on my own jquery plugin

Im making my own little timepicker, calling it xxxtimepicker. Ill paste some code belowe, but the problem is that nothing happens. Any tips/tricks and help when making a addon that works like datepicker?

    (function($){

    var popupname = "timepickerpopup";

    function OpenWindow(parentObj) {

        var popup = $('<div id="'+popupname+'" style="">POPUP</div>');
        var offset = $(parentObj).offs开发者_如何学Goet();
        offset.top += 20;

        $(popup).offset( offset );

        $("body").append(popup);
        $("body").append('<script>$("#timepickerpopup").dialog({autoOpen: false});</script>');
    }

    function CloseWindow() {
        $("#"+popupname).remove();
    }

    $.fn.extend({

        xxxtimepicker: function() {

            var defaults = {
                varname: "val",
                var2name: "val"
            };

            var options = $.extend(defaults, options);

            return this.each(function() {

                var o = options;
                var obj = $(this);

                obj.bind("focus", OpenWindow(this));
                obj.bind("blur", CloseWindow);

            });
        }

    });

})(jQuery);

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Put functions OpenWindow() & CloseWindow() inside xxxtimepicker function. Tip: don't use global variables like popupname it creates problems for multiple xxxtimepicker on one page.