怎么实现多个div下li标签，一次点击显示6个，各个div不冲突

如何实现多个div下li标签，一次点击显示6个，各个div不冲突

 <div class="list_all fz15">

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                            <a href="#" ><img src="list_logo.jpg" alt=""><span class="fl">7k7k灌水乐园</span></a>

                        </div>

<div class="list_btn"><a href="javascript:"></a></div>

我有多个这样的div，我要实现点击list_btn，要显示list_all里面的a标签，一次显示6个，一直到显示所有，jQuery要怎么样写，新手求指导
------解决思路----------------------
<script>$('.list_btn a').click(function(){
  $('.list_all a:hidden:lt(6)').show()
})</script>