drop menu

HTML

<div class="knop" data="1">
    <div class="b" data="1"></div>
</div>
<div class="knop" data="2">
    <div class="b" data="2"></div>
</div>

CSS

.b {
    width:100px;
    height:100px;
    background-color:#FF6600;
    margin-top:35px;
}
.knop {
    float:left;
    margin-right:12px;
    background-color:#CCCCCC;
    height:135px;
    width:100px;
}

JavaScript

$(document).ready(function () {
    $('.knop').click(function () {
        $(this).children('.b').fadeOut();
    });
});