html - Jquery panel + scroll from top detection? -

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i testing type of panel jquery : http://codyhouse.co/gem/css-slide-in-panel/

but when want detect scroll top make appear div : no way :(

a means detect scroll top inside panel? use kind of thing without result http://jsfiddle.net/apaul34208/zykar/3/

$(document).scroll(function () {     var y = $(this).scrolltop();     if (y > 500) {         $('.cache').fadein();     } else {         $('.cache').fadeout();     }  });

best regards,

is looking for?

http://jsfiddle.net/zykar/2327/

html

<div class="topmenu"></div>

css

body {     height:1600px; } .topmenu {     display: none;     position: fixed;     top: 0;     width: 100%;     height: 60px;     border-bottom: 1px solid #000;     background: red;     z-index: 1; }

javascript

$(document).scroll(function () {     var y = $(this).scrolltop();     if (y > 1) {         $('.topmenu').fadein();     } else {         $('.topmenu').fadeout();     }  });

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