Toggle position fixed depending on scroll position

Question

I have the following code which fixes the position of a menu at the point that it is going to scroll off the top of the page.

$(function () {
    var msie6 = $.browser == 'msie' && $.browser.version < 7;
    if (!msie6) {
    var top = $('.menu').offset().top - parseFloat($('.menu').css('margin-top').replace(/auto/, 0));
    $(window).scroll(function (event) {
    var y = $(this).scrollTop();
    if (y >= top) {
    $('.menu').addClass('fixed');
    } else {
    $('.menu').removeClass('fixed');
    }
    });
    }
}); 

css

.container {
    width:400px; 
    margin:auto;
}

.header {
    background-color:#096; 
    height:150px;
}

.fixed {
    position:fixed;
    top:0px;
    left:50%;
    margin-left:50px;
}

.bodyContainer {
    overflow:hidden;
}

.menu {
    float:right; 
    width:150px; 
    height:250px; 
    background-color:#F00;
}

.bodyCopy {
    float:left; 
    width:250px; 
    height:1000px;
}

.footer {
    background-color:#096; 
    height:250px;
}

HTML

<div class="container">

<div class="header">
    <p>Test Header</p>
</div>

<div class="bodyContainer">

    <div class="menu">
        <p>test</p>
    </div>

    <div class="bodyCopy">
        <p>test</p>
    </div>

</div>


<div class="footer">
    <p>Test Footer</p>
</div>

What I now want to do is make it start scrolling again when the user reaches the bottom of the page (so that it does not cover the footer in the page).

jsfiddle here...

Answer 1

Here is new a approach with css3.

use position:sticky to follows the scroll.

Here is the article explained.

http://updates.html5rocks.com/2012/08/Stick-your-landings-position-sticky-lands-in-WebKit

and old way of doing this demo

with sticky position demo