Plain Code

(function( $ ) {

// http://codedumper.com/azoku

var win = $( window ),
    winTop,
    elems = [],
    bound = false;

function normalize( val ) {
    return $.isFunction( val ) ? val() : val;
}

function position() {
    var currentTop = this.elem.offset().top,
        options = this.options,
        min = normalize( options.min );

    if ( windowTop > min || currentTop > min ) {
        var top = Math.max( windowTop, min );
        if ( options.max ) {
            top = Math.min( top, normalize(options.max) );
        }
        this.elem.stop().animate({
            top: top
        }, 200);
    }
}

$.fn.floatFixed = function( options ) {
    options = $.extend( { min: "auto" }, options );
    // TODO: make this work with multiple elements
    if ( options.min === "auto" ) {
        options.min = self.offset().top;
    }

    this.each(function() {
        elems.push({ elem: $(this), options: options });
    });

    if ( !bound ) {
        win.scroll(function() {
            windowTop = win.scrollTop();
            $.each( elems, position );
        });
    }

    return this;
};

})( jQuery );