/* aqFloater v1.1 - Floats an element that attaches itself to a part of the browser window.
Copyright (C) 2009 Paul Pham <http://aquaron.com/~jquery/aqFloater>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
(function($) {
    $.fn.aqFloater = function($o) {
        var _opts = $.extend({
            offsetX: 0, offsetY: 0, attach: '', duration: 50, opacity: '.9'
        }, $o);

        var $obj = this;
        $obj.css({ position: 'absolute', opacity: _opts.opacity });

        var _show = function() {
            var _de = document.documentElement;

            var _y = (_opts.attach.match(/n/) ? 0
            : (_opts.attach.match(/s/)
               ? (_de.clientHeight - $obj.outerHeight() - 10)
               : Math.round((_de.clientHeight - $obj.height()) / 2)));

            var _x = (_opts.attach.match(/w/) ? 0
            : (_opts.attach.match(/e/)
               ? (_de.clientWidth - $obj.outerWidth() - 10)
               : Math.round((_de.clientWidth - $obj.width()) / 2)));

            $obj.animate({
                top: (_y + $(document).scrollTop() + _opts.offsetY) + 'px',
                left: (_x + $(document).scrollLeft() + _opts.offsetX) + 'px'
            }, { queue: false, duration: _opts.duration });
        };

        $(window).scroll(_show).resize(_show);

        $(window).trigger('scroll');
    };
})(jQuery);