jQueryの簡易タブ切り替えエフェクト実装method_jquery

<script src="js/jquery-latest.js"></script>
<SCRIPT language=javascript type=text/javascript>
$(document).ready(function () {
$('.tabtitle li').click(function () {
var index = $(this).index();
$(this).attr('class',"tabhover").siblings('li').attr('class','taba');
$('.tabcontent').eq(index).show(200).siblings('.tabcontent').hide();
});
  var t = 0;
  var timer = setInterval(function(){
    if( t == $('.tabtitle li').length ) t = 0;
    $('.tabtitle li:eq('+t+')').click();
    t++;
  }, 700)
})
</SCRIPT>
<div class="maintab">
<ul class="tabtitle">
<li class="tabhover"><a href="#">选择标题1</a></li>
 <li class="taba"><a href="#">选择标题2</a></li>
 <li class="taba"><a href="#">选择标题3</a></li>
 <li class="taba"><a href="#">选择标题4</a></li>
 <li class="taba"><a href="#">选择标题5</a></li>
</ul>
<div class="tabcontent">
选择内容1
</div>
<div class="tabcontent" style="DISPLAY: none">
选择内容2
</div>
<div class="tabcontent" style="DISPLAY: none">
选择内容3
</div>
<div class="tabcontent" style="DISPLAY: none">
选择内容4
</div>
<div class="tabcontent" style="DISPLAY: none">
选择内容5
</div>
</div>