Java Problem

[Powlo]

I am trying to create an extra info click point on each thread within the threadbit using javascript.

So under every thread title there will be a clickable 'Extra Info'

ie.

The Title of my Thread
Extra Info

The extra info is called from another template, the code i am using does work but only for the first thread.

How can i get this to work with all threads?

PHP Code:

 <script language="JavaScript">  

     function expand(param)  
     {  
         param.style.display=(param.style.display=="none")?"":"none";  
     }  

 </script>  

<a href="javascript:expand(document.getElementById('div1'))">Extra Info</a>  
       <div class="dottedBorders" id="div1" width="300px" style="display:none">  
                     <span class="normal">$extrainfo</span> 

</div> 


Any ideas?