I have this script who will set a text to an existing or newly created <span>. When I executed the script, I can see ths <span> element to the source but the text never appear.

Here is the last version of this script (the alert box is displayed but the "_message" is never dispalyed to the page):

2. var _message = response[inputId];
3.    var $field = $(jqn('#'+inputId)); 
4.    var $span  = $(jqn('#'+inputId+'.errors'));
6.    /* If the span isn't already in this page and if we have a 
7.     * message to display, we create the span. 
8.     * If we have already a span in the page we empty it. */
9.    if ( $span.length==0 && _message.length>0 ) {
10.    $span = $('<span id="'+inputId+'.errors" '+ 
11. 'class="message error"></span>')
12. .css('float','right');
13. $field.after($span);
14.    } else {
15.    $span.empty();
16.    }
17. 
    
18.    /* If we have a message we set the message and display it 
19.     * else we hide the element that was created or cleared 
20.     * previously. */
21.    if ( _message.length>0 ) {
22.     alert("Display "+_message+" in "+$span+" ("+$span.length+")");
23.     //$span.html(_message);
24.      //$span.text(_message);
25.     $span.append(document.createTextNode("Hello"));
26.     //$span.show();
27.    } else {
28. $span.hide();
29.    }