$(document).ready(function () {
    var $div = $('#container');
    var height = $div.height();
    $div.hide().css({ height : 0 });
 
    $('#feedback').click(function () {
        if ($div.is(':visible')) {
            $div.animate({ height: 0 }, { duration: 300, complete: function () {
                $div.hide();
            } });
        } else {
            $div.show().animate({ height : height }, { duration: 300 });
        }
        
        return false;
    });
});

function hideLayer() { 
document.getElementById("container").style.display = "none"; 
}