javascript - Stop div scrolling once it reaches another div

Question

Basically I currently have a div which stays fixed and follows the user down as they scroll until it reaches a certain point. I can easily make it stop at a fixed pixel position as I have done in the below example, but because I'm a jQuery idiot I have no idea how to make it stop at a div instead.

Here's what I've used so far:

var windw = this;

$.fn.followTo = function ( pos ) {
     var $this = this,
        $window = $(windw);

$window.scroll(function(e){
    if ($window.scrollTop() > pos) {
        $this.css({
            position: 'absolute',
            top: pos
        });
    } else {
        $this.css({
            position: 'fixed',
            top: 0
        });
    }
});
};

$('#one').followTo(400);

Here's the example: jsFiddle

The reason I want it to stop once it reaches a second div is because with the fluid layout I'm using, the second div will be sitting at different points depending on the browser size. Defining a specific point for it to stop at won't work. Anyone got any ideas as to how I can get this to do what I want? Alternatively, is it possible for the fixed div to stop scrolling once it reaches a percentage of the way down? I've looked around but haven't found anything.

Thanks for any help.

Answer 1

Is this what you were looking for?

http://jsfiddle.net/Tgm6Y/1447/

var windw = this;

$.fn.followTo = function ( elem ) {
    var $this = this,
        $window = $(windw),
        $bumper = $(elem),
        bumperPos = $bumper.offset().top,
        thisHeight = $this.outerHeight(),
        setPosition = function(){
            if ($window.scrollTop() > (bumperPos - thisHeight)) {
                $this.css({
                    position: 'absolute',
                    top: (bumperPos - thisHeight)
                });
            } else {
                $this.css({
                    position: 'fixed',
                    top: 0
                });
            }
        };
    $window.resize(function()
    {
        bumperPos = pos.offset().top;
        thisHeight = $this.outerHeight();
        setPosition();
    });
    $window.scroll(setPosition);
    setPosition();
};

$('#one').followTo('#two');

EDIT: about your request to not scroll until a certain point, just replace this:

if ($window.scrollTop() > (bumperPos - thisHeight)) {

with this:

if ($window.scrollTop() <= (bumperPos - thisHeight)) {