Help getting data out of responseXML

[acroporas]

I want my javascript to recieve an xml page containing two bits html code to insert into various places in the page.

example xml page

 <?xml version="1.0" ?> 
  <root>
     <image><img src="images/image1.jpg" class="imageclass" /></image> 
    <exif>
<table>
<tr><td>Head</td><td>Data</td>
.....
<tr><td>Head</td><td>Data</td>
</table>
    </exif>
</root>

I am pretty confident that I am sucessfully reciving the file as I can get the following.

window.alert(ajaxreq.responseXML);
// displays "[object XMLDocument]" in firefox
// displays "[object]" in IE7

window.alert(ajaxreq.responseXML.xml);
// displays the contents of the xml file in IE7
// displays "undefined" in firefox

Seems so good so far....
But that is far as I can get.

When I try
window.alert(ajaxreq.responseXML.getElementsByTagName("image")[0].nodeValue);
//returns null in both IE and Firefox.....

Am I doing something wrong? How do I get the contents of <image> and <exif> nodes so that I can insert them into my page?

[glenngv]

var xmlDoc = ajaxreq.responseXML.documentElement;
alert(xmlDoc.getElementsByTagName("image")[0].nodeValue);