"var is undefined" when passing from onClick

[Tarantulus]

Hi guys,

I'm trying to initiate an ajax event from an onclick.

my link code is:

<a href="404.html" onclick="getContent('test'); return false;">something</a>

and my javascript is

function getContent()
        {
        if (window.XMLHttpRequest)
          {// code for IE7+, Firefox, Chrome, Opera, Safari
          xmlhttp=new XMLHttpRequest();
          }
        else
          {// code for IE6, IE5         
          xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
          }      
        xmlhttp.onreadystatechange=function()
          {
          if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
              document.getElementById("main-content").innerHTML=xmlhttp.responseText;
            }
          }      
        xmlhttp.open("POST","./lib/page.php",true);
        xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
        xmlhttp.send("page_id=" + id)
        xmlhttp.send();
        }

in an external file

I cannot for the life of me work out why I'm getting "id is undefined" errors in firefox, can you guys give me some pointers?

Thanks in advance

[gits]

does that occur in line 20? where is that variable id declared and/or where do you assign a value to it?