如何实现选项卡自动切换


如上图，如何实现选项卡的自动切换，比如：第一个界面是在俊采深度，3秒钟后希望自动变为“行业新闻，以此类推”

<ul id="gai-tab" class="news-nav">

					<li class="first active">

						<label>俊采深度</label><a href="{PE.Label id="取得节点链接路径" nodeId="37" /}" class="more" title="俊采深度"></a>

						<ul class="cont1">

							

{PE.Label id="shouyexinwen" nodeids="37" len="90" ts="5" /}

							



							

						</ul>

					</li>

					<li>

						<label>行业新闻</label><a href="{PE.Label id="取得节点链接路径" nodeId="38" /}" class="more" title="行业新闻"></a>

						<ul class="cont1">

							

{PE.Label id="shouyexinwen" nodeids="38" len="90" ts="5" /}				

							

						</ul>

					</li>

					<li>

						<label>俊采公告</label><a href="{PE.Label id="取得节点链接路径" nodeId="39" /}" class="more" title="俊采公告"></a>

						<ul class="cont1">

							

{PE.Label id="shouyexinwen" nodeids="39" len="90" ts="5" /}

						</ul>

					</li>

					<li>

						<label>解决方案</label><a href="{PE.Label id="取得节点链接路径" nodeId="40" /}" class="more" title="解决方案"></a>

						<ul class="cont1">

							

				{PE.Label id="shouyexinwen" nodeids="40" len="90" ts="5" /}	



							

						</ul>

					</li>

                    

                    	<li>

						<label>HR专区</label><a href="{PE.Label id="取得节点链接路径" nodeId="41" /}" class="more" title="HR专区"></a>

						<ul class="cont1">

							

						{PE.Label id="shouyexinwen" nodeids="41" len="90" ts="5" /}

							

							

							



							

						</ul>

					</li>

                    

                    

                             	<li>

						<label>人才服务</label><a href="{PE.Label id="取得节点链接路径" nodeId="42" /}" class="more" title="人才服务"></a>

						<ul class="cont1">

					{PE.Label id="shouyexinwen" nodeids="42" len="90" ts="5" /}

							

						</ul>

					</li>

                    

				</ul>

			</div>

			<div class="gaibottom"></div>

		</div>  

求给出详细的js代码,我想直接插入到html代码中。谢谢！