[Little Demo] Example code for double switching of left and right tab tabs

<div class="tab-Infomations">
    <div class="arrows"></div>
    <div class="tab-content">
        <div class="tab-info">
            <div class="info info1">
                <p>
                    We provide a full spectrum of online advertising...
                    <br />
                    <a href="#" class="GlobalButton"><span>Tour Our Services</span></a>
                </p>
            </div>
            <div class="info info2 hidden">...</div>
            <div class="info info3 hidden">... </div>
            <div class="info info4 hidden">... </div>
        </div>
        <div class="tab-thumbs">
            <ul>
                <li class="selected"><a href="javascript:;">What We Do</a></li>
                <li><a href="javascript:;">Who We Are</a></li>
                <li><a href="javascript:;">Why Choose Us</a></li>
                <li><a href="javascript:;">How We Work</a></li>
            </ul>
        </div>
    </div>
</div>

body, ul, li { margin: 0; padding: 0; }
body, button, input, select, textarea { font: 12px/1.5 tahoma, arial, \5b8b\4f53; }
ul, ol,li { list-style: none; }
a { text-decoration: none;}
.hidden {display: none;}
/*----------   tab ------------*/
.tab-Infomations {position: relative;width: 959px;margin: 10px auto;}
.tab-content  {width:912px;height:324px;background: url("../imgs/tab-for-infomation/slidebg.jpg")  no-repeat;
   overflow: hidden;margin: 0 auto;}
/*----------   tab-thumbs ------------*/
.tab-thumbs{ position: absolute;bottom: 0;}
.tab-thumbs li { float: left;width: 228px;height: 50px;}
.tab-thumbs li a { width: 228px;height: 50px;display: block;color: #ffffff;font-size: 18px;font-family: Arial,sans-serif;line-height: 50px;text-align: center; }
.tab-thumbs li.selected a{ cursor: default;text-shadow: 1px 1px 1px #374f10;}
/*----------   tab-info ------------*/
.tab-info { width:912px;height:324px;}
.info {width: 912px;height: 324px;position: absolute;}
.info p{ color:#1d1d1d;font-size: 12px;line-height: 20px;margin-left: 326px;margin-top: 142px;width: 542px; }
.info1 { background: url("../imgs/tab-for-infomation/billboard1.png") no-repeat; }
.info2 { background: url("../imgs/tab-for-infomation/billboard2.png") no-repeat; }
.info3 { background: url("../imgs/tab-for-infomation/billboard3.png") no-repeat; }
.info4 { background: url("../imgs/tab-for-infomation/billboard4.png") no-repeat; }
.GlobalButton {background: url("../imgs/tab-for-infomation/btn_right.png") no-repeat  top right;display: block;float: left;font-weight: bold;height: 31px;margin-top: 20px;padding-right: 20px;}
.GlobalButton span { background: transparent url("../imgs/tab-for-infomation/btn_left.png") no-repeat 0 0;line-height: 18px;line-height: 18px;padding: 7px 0 6px 20px;color: #252525;display: block;}
/*----------   tab-info ------------*/
.arrows { position: absolute;}

<div class="tab-Infomations">
    <div class="arrows">
        <a class="arrows-left prev"></a>
        <a class="arrows-right next"></a>
    </div>
    <div class="tab-border">
        <div class="tab-content">
            ...
        </div>
    </div>
</div>

.tab-border { border: 1px solid #cccccc;margin: 0 auto;padding:3px;width: 912px;}
/*----------   tab-arrows ------------*/
.arrows a { display: block;height: 41px;width:41px;top: 143px;z-index: 10;position: absolute;cursor: pointer;}
.arrows-left {background: url("../imgs/tab-for-infomation/arrows.png") no-repeat  0 0;left: 0;}
.arrows-right {background: url("../imgs/tab-for-infomation/arrows.png") no-repeat  -41px 0px;right: 0;}
.arrows-left:hover,.arrows-right:hover {background-position-y: -41px;}

$(document).ready(function () {
    var mIndex = 0;
    var maxIndex = $(".tab-thumbs li").length-1;
    $(".tab-thumbs li").click(function () {
        var mIndex = $(this).index();
        changeTab(mIndex);
    });
    $(".arrows-right").click(function () {
        if(mIndex<maxIndex){
            mIndex++;
        }else {
            mIndex = 0;
        }
        changeTab(mIndex);
    });
    $(".arrows-left").click(function () {
        if(mIndex>0){
            mIndex--;
        }else {
            mIndex = maxIndex;
        }
        changeTab(mIndex);
    });
})
function changeTab(theIndex) {
    $(".tab-thumbs li").removeClass("selected");
    $(".tab-thumbs li").eq(theIndex).addClass("selected")
    $(".info").stop();
    $(".info").fadeOut();
    $(".info").eq(theIndex).fadeIn();
}