jQuery.noConflict();
jQuery(document).ready(function(){
    
    // BTN Friends Slider
    jQuery('#button').click(function () {
        jQuery(this).next().animate({height: 'toggle'}, {duration: 300}); return false;
    });
});

<div id="button">Friends</div>
<div id="Container">
    aaa<br />
    aaa<br />
    aaa<br />
    aaa<br />
    aaa<br />
</div>

#button{
    float:        left;
    width:         200px;
    height:     20px;
    border:        1px solid;
    cursor:        pointer;
}

#Container{
    float:        left;
    clear:        both;
    width:         200px;
    height:     100px;
    border:        1px solid;
}