How to make a div not scroll off the page using jquery -

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basically have structure this:

<body>    <div> main content </div>    <div> toolbar </div>    <div> results </div>

when scrolling down, want "main content" disappear off screen. 'toolbar' stay flush top of page, , 'results' scroll, disappearing 'toolbar' scroll.

edit: toolbar starts off in middle of screen. want scroll top, no further, rest of page (below) keeps scrolling.

i found tutorial http://www.wduffy.co.uk/blog/keep-element-in-view-while-scrolling-using-jquery/

but different. in example above, although toolbar stays near top, prevents results being scrolled.

i have position:fixed; toolbar. way stay fixed in view. 

<body>    <div> main content </div>    <div style="position:fixed;"> toolbar </div>    <div> results </div>

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