Javascript help :)

Hey dont know if any one can help me but im trying to when you click a value on a dropdown list it shows a pic and a link it 2 difretn divs i did have ago at making the script my self but dont thinkl i did it right i aint very good in javscript/ajax here is the code i made:-

function editlink(1) 
{ 

    var frm = document.editlinks; 

    
	var headertopimage = '<img src="images/headertoplink.gif" title="" alt="" />';
	var headertoptext = 'Click <a onclick="">here to edit these links.';
	
	var headerbottomimage = '<img src="images/headertoplink.gif" title="" alt="">';
	var headerbottomtext = 'Click <a onclick="">here</a> to edit these links.';
	
	var headertopimage = '<img src="images/headertoplink.gif" title="" alt="">';
	var headertoptext = 'Click <a onclick="">here to edit these links.';
	
	
	
if (1) { document.getElementById('exampleimage').innerHTML= headertopimage ; }
else {}
if (1) { document.getElementById('examplelink').innerHTML= headertoptext ; }
else {}
	
if (2) { document.getElementById('exampleimage').innerHTML= headerbottomimage ; }
else {}
if (2) { document.getElementById('examplelink').innerHTML= headerbottomtext ; }
else {}
}

Code (markup):

and the divs and dropt down box will be like:-

<table border="0" cellpadding="3" cellspacing="0" width="80%" height="364">
 <tr>
   <td width="100%" height="359">
   <table border="0" cellpadding="3" cellspacing="0" width="100%" height="349">
     <tr>
       <td width="29%" height="343">

<form class="editlinks" id="editlinks" action="">
  <select size="11" name="Select">
  <option value="Select" selected>Select</option>
  <option value="Header Top" onclick="editlink(1)">Header Top</option>
  <option value="Header Bottom" onclick="editlink(2)">Header Bottom</option>
       </select>
</form>       
       </td>
       <td width="71%" height="343">
       <table border="0" cellpadding="0" cellspacing="0" width="100%" height="330">
         <tr>
           <td width="100%" height="298"><div id="exampleimage">div image</div></td>
         </tr>
         <tr>
           <td width="100%" height="32"><div id="examplelink">div text</div></td>
         </tr>
       </table>
       </td>
     </tr>
   </table>
   </td>
 </tr>
</table>

HTML:

If any one can help would be great or is there a script out there like this.

Thanks in advanced.