how to display treeview in jsp

Hi Experts,

I have a JSP page which will display a list in each column.
I have a BL list and Container List , 1 BL can contain 1 or morethan 1 containter.

I need to display these items in treeview using Javascript or JSP.

Ex:  +BL

and ones the user clicks on + sign
then it should be like


My Jsp code looks like

<display:column title="BL Number" property="blNumber" group="1" align="left" />
<display:column title="Container Number" property="containerNumber" align="left"/>      

right this will display like


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Try out this simple demonstration:

            <title>Script Demo Gops</title>
                        li ul{display:none;}
                        ul li{color:blue;text-decoration:underline;cursor:pointer}
                  <script type="text/javascript">
                        var oldMenu="";
                        function showHide(obj){
                              if(oldMenu) oldMenu.childNodes[1].style.display='none';
                              if(oldMenu==obj) {oldMenu=""; return true;}
      <li onclick="showHide(this);">BL1
                  <li>Container 1 BL1
                  <li>Container 2 BL1
      <li onclick="showHide(this);">BL2
                  <li>Container 1 BL2
                  <li>Container 2 BL2
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