如何使div贴在滚动页面的顶部附近？

Question

How can I get the two purple buttons on this page (or rather the white parent container slide2) to stick right underneath the red header div when it hits the bottom edge of it upon scrolling?

I created this fiddle: http://jsfiddle.net/baumdexterous/K7NSX/

A similar example of what I'm trying to accomplish: http://jsbin.com/ijexe

HTML:

<div id="container">

    <div class="menu">
        <div class="container clearfix">

            <div id="header" class="grid_12">
            </div>
        </div>
    </div>


    <div class="slide" id="slide1">
        <div class="container clearfix">

            <div id="section1" class="grid_12">
            </div>


        </div>
    </div>

    <div class="slide" id="slide2">
        <div class="container clearfix">

            <div id="test" class="grid_6">
                <a href="" target="_blank" class="btn1"></a>
            </div>

            <div id="test" class="grid_6 omega">
                <a href="" target="_blank" class="btn2"></a>
            </div>

        </div>
    </div>

    <div class="slide" id="slide3">
        <div class="container clearfix">

            <div id="section3" class="grid_12">
            </div>
        </div>
</div>

Thanks so much!

Answer 1

Check this out...... it's what you want.

http://www.jsfiddle.net/5ADzD/1

$window.scroll(function(event) {
   var scrollTop = $window.scrollTop()
   if (scrollTop >  ... )
   {
       //execute code
   }
   else
   {
       //execute other code
   } 
});

Answer 2

Try this script.

 var $window = $(window);
            $stickyEl = $('#youelementID');
            var elTop = $stickyEl.offset().top;
            $window.scroll(function() {
                var windowTop = $window.scrollTop();
                $stickyEl.toggleClass('sticky', windowTop > elTop);
            });

/// and Css

.sticky
{
    position: fixed;
    top: 0px;
}