Animated button click scroll menu with stopper

by ctwheels

HTML

<div id="outer">
    <input type="button" value="move left by -1" class="left" />
    <input type="button" value="Move Right by +1" class="right" />
    <ul id="menulist">
        <li>Menu 1</li>
        <li>Menu 2</li>
        <li>Menu 3</li>
        <li>Menu 4</li>
        <li>Menu 5</li>
        <li>Menu 6</li>
        <li>Menu 7</li>
        <li>Menu 8</li>
        <li>Menu 9</li>
        <li>Menu 10</li>
        <li>Menu 11</li>
        <li>Menu 12</li>
    </ul>

CSS

#outer {
    width:448px;
    overflow:hidden;
}
.left {
    float:left;
}
ul, li {
    list-style:none;
    margin:0;
    padding:0;
    overflow:hidden;
}
ul {
    font-size:0;
    float:left;
    width:1400px;
}
li {
    display:inline-block;
    padding:5px;
    background:lightgrey;
    border:darkgrey;
    width:100px;
    overflow:hidden;
    text-align:center;
    font-size:14px;
    border:1px solid black;
}

JavaScript

$('.left').click(function () {
    if (parseInt($('#menulist').css('margin-left'), 10) >= -784) {
        $('#menulist').animate({
            'marginLeft': "-=112px" //moves left
        });
    }
});
$('.right').click(function () {
    if (parseInt($('#menulist').css('margin-left'), 10) >= 0) {
        $('#menulist').css('margin-left', '0px!important');
    } else {
        $('#menulist').animate({
            'marginLeft': "+=112px" //moves right
        });
    }
});