Taking from an example that works:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Show-Hide Divs</title>
    <script type="text/javascript" 
src="http://ajax.googleapis.com/ajax/libs/prototype/1.7/prototype.js";></script>
    <style type="text/css" media="screen">
     .toggle {
       padding: 0;
       margin-left: 1em;
       background-color: #989699;
       border: 2px solid #1f0c00;
       float: left;
       opacity:0.7;
     }
     #menu {
       float: left;
     }
    </style>
</head>
<body>
    <div id="menu">
     <ul>
       <li><a href="#thing_1">One</a></li>
       <li><a href="#thing_2">Two</a></li>
       <li><a href="#thing_3">Three</a></li>
       <li><a href="#thing_4">Four</a></li>
       <li><a href="#thing_5">Five</a></li>
       <li><a href="#thing_6">Six</a></li>
     </ul>
    </div>
  <div id="thing_1" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <div id="thing_2" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <div id="thing_3" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <div id="thing_4" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <div id="thing_5" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <div id="thing_6" class="toggle">
   <p>&copy; by flicr.com<br/><a href="http://tinyurl.com/cwtt2yq";>See 
Photo</a></p>
  </div>
  <script type="text/javascript">
    var toggles = $$('.toggle').invoke('hide');
    $('menu').on('mouseover', 'a', function(evt, elm){
      evt.stop();
      toggles.invoke('hide');
      $(elm.href.split('#').last()).show();
    });
    $('menu').on('mouseout', 'a', function(evt, elm){
      evt.stop();
      toggles.invoke('show');
      $(elm.href.split('#').last()).hide();
       toggles = $$('.toggle').invoke('hide');
    })
  </script>
</body>
</html>

I tried to apply this script to a complete webpage but i trows me an error 
TypeError the $('') function considers the id i pass to it as a null. My 
web page is longer.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";><html 
xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en"><head><style 
type="text/css">@import url(styles.css);  </style>  <script 
type="text/javascript" 
src="http://ajax.googleapis.com/ajax/libs/prototype/1.7/prototype.js 
<view-source:http://ajax.googleapis.com/ajax/libs/prototype/1.7/prototype.js>"></script>
  <script type="text/javascript">                                               
               var toggles = $$('.toggle').invoke('hide');                      
                                       $('gallery').on('mouseover', 'a', 
function(evt, elm){                                                           
evt.stop();                                                               
toggles.invoke('hide');                                                         
        $(elm.href.split('#').last()).show();                                   
                      });                                                       
      $('gallery').on('mouseout', 'a', function(evt, elm){                      
                                        evt.stop();                             
                                toggles.invoke('show');                         
                                        $(elm.href.split('#').last()).hide();   
                                                        toggles = 
$$('.toggle').invoke('hide');                                                   
            });  </script><title>Python Speculative 
Interface</title></head><body>                  <div class="main"><div 
id="header">                     <div class="primariga">                        
                                 <div class="tab-active">                       
         <a href="/py/index.php?tabindex=0 
<view-source:http://localhost/py/index.php?tabindex=0>">Concept                 
              </a>                            </div>                          
<div class="tab">                               <a 
href="/py/index.php?tabindex=1 
<view-source:http://localhost/py/index.php?tabindex=1>">Wiki                    
      </a>                            </div>                  </div>          
</div></div><div class="main">          <div class="tab-content" ><div 
class="main">            <img class="logo" src="images/psi.png 
<view-source:http://localhost/py/images/psi.png>" /></div>                      
                  <div class="containere">                                <div 
class="boxtab">                                    <form 
action="http://joy.indivia.net/py/cgi-bin/OOpoetry.cgi 
<view-source:http://joy.indivia.net/py/cgi-bin/OOpoetry.cgi>" method="get">     
                                   <h>Python from a theoretical point of 
view</h>                                  <p>This interface aims to show and 
explain some communicative and theoretical aspects inscribed in the mechanisms 
behind a programming language. The programming language named Python is useful 
to achieve this goal as it provides an interpreter but it can even run source 
code as object code.</p>                                 <p>If you search for a 
command of the python programming language in the form below you will get the 
description of the logical and communicative process executed by it in the 
machine. The explanation can be of a logical, mathematical or semiological 
nature.</p><p> This is an attempt to enhance python programming language as a 
signifying language, which can execute not only algebrical processes but even 
what could be defined as meaning.</p><br />                                     
 <p>                                             <input id="example" 
name="stringx" value="type here"/>&nbsp;&nbsp;<input id="submit" type="submit" 
value="search"/></form></p>                                  </div>             
             <div id="gallery"><ul><li>                                         
             <a href="#thing_1 
<view-source:http://localhost/py/index.php#thing_1>"><img class="galleryitem" 
src="images/gallery1.jpg.jpg 
<view-source:http://localhost/py/images/gallery1.jpg.jpg>"/></a></li><li>       
                                           <a href="#thing_2 
<view-source:http://localhost/py/index.php#thing_2>"><img class="galleryitem" 
src="images/3188832812_573db43c7d.jpg 
<view-source:http://localhost/py/images/3188832812_573db43c7d.jpg>"/></a></li><li>
                                                        <a href="#thing_3 
<view-source:http://localhost/py/index.php#thing_3>"><img class="galleryitem" 
src="images/3188858500_3437070b8f.jpg 
<view-source:http://localhost/py/images/3188858500_3437070b8f.jpg>"/></a></li><li>
                                                        <a href="#thing_4 
<view-source:http://localhost/py/index.php#thing_4>"><img class="galleryitem" 
src="images/3188063503_e2b752444f.jpg 
<view-source:http://localhost/py/images/3188063503_e2b752444f.jpg>"/></a></li><li>
                                                        <a href="#thing_5 
<view-source:http://localhost/py/index.php#thing_5>"><img class="galleryitem" 
src="images/3188039487_5fa50f0d02.jpg 
<view-source:http://localhost/py/images/3188039487_5fa50f0d02.jpg>"/></a></li><li>
                                                        <a href="#thing_6 
<view-source:http://localhost/py/index.php#thing_6>"><img class="galleryitem" 
src="images/3188061317_d7a4bb7c27.jpg 
<view-source:http://localhost/py/images/3188061317_d7a4bb7c27.jpg>"/></a></li></ul></div>
                                         <div id="thing_1" class="toggle">      
                                                         <p>&copy; by 
flicr.com<br/><a href="http://tinyurl.com/cwtt2yq 
<view-source:http://tinyurl.com/cwtt2yq>">See Photo</a></p>                     
                                 </div>                                         
         <div id="thing_2" class="toggle">                                      
                         <p>&copy; by flicr.com<br/><a 
href="http://tinyurl.com/cwtt2yq <view-source:http://tinyurl.com/cwtt2yq>">See 
Photo</a></p>                                                      </div>       
                                           <div id="thing_3" class="toggle">    
                                                           <p>&copy; by 
flicr.com<br/><a href="http://tinyurl.com/cwtt2yq 
<view-source:http://tinyurl.com/cwtt2yq>">See Photo</a></p>                     
                                 </div>                                         
         <div id="thing_4" class="toggle">                                      
                         <p>&copy; by flicr.com<br/><a 
href="http://tinyurl.com/cwtt2yq <view-source:http://tinyurl.com/cwtt2yq>">See 
Photo</a></p>                                                      </div>       
                                           <div id="thing_5" class="toggle">    
                                                           <p>&copy; by 
flicr.com<br/><a href="http://tinyurl.com/cwtt2yq 
<view-source:http://tinyurl.com/cwtt2yq>">See Photo</a></p>                     
                                 </div>                                         
         <div id="thing_6" class="toggle">                                      
                         <p>&copy; by flicr.com<br/><a 
href="http://tinyurl.com/cwtt2yq <view-source:http://tinyurl.com/cwtt2yq>">See 
Photo</a></p>                                                      
</div></div></div></div></body></html>


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