Ideas para intercambiar texto por imagenes desde XML

[ZiTAL]

lo hago yo a pelo:
http://zital.no-ip.org/txat/js/ajax.js

Código PHP:

              var messages=ajax.responseXML;
        messages=messages.getElementsByTagName('ms');
        messages=messages.item(0);
        var message=messages.getElementsByTagName('m');
            for(var i=0;i<message.length;i++)
             {         
                var id=message[i].getElementsByTagName('id');
                id=id.item(0);
                id=id.firstChild.nodeValue;
                
                if(in_array(id,tmpCommentsId)==true) // if repeated ID in the same ajax response break
                {
                    break;
                }
                
                var date=message[i].getElementsByTagName('date');
                date=date.item(0).firstChild.nodeValue;
                
                var name=message[i].getElementsByTagName('name');
                name=name.item(0).firstChild.nodeValue;
                
                var comment=message[i].getElementsByTagName('comment');
                comment=comment.item(0).firstChild.nodeValue;
                
                var span=document.createElement('span'); // create span element                                
                span.id="span"+id;         // set ID to the span
                                
                var strong=document.createElement('strong');
                var txt=document.createTextNode(date+" - "+name+": ");
                var txt2=document.createTextNode(comment);
                var br=document.createElement('br');

                strong.appendChild(txt);
                span.appendChild(strong);
                span.appendChild(txt2);
                span.appendChild(br);
                chat.appendChild(span); // insert span into chat
             }