[Moo] Request HTML not working

[farid silva aboid]

Hi, I'm newbie to mootools and trying to make an interactive form
which load sections according previous selection by the user.

under mootools 1.2.3 I'm using Request in this way:

function loadPage(url,container,loadInfoText)    {
           var myRequest = new Request(
           {
                 url: url,
                 method: 'get',
                  onRequest: function()
                 {...            },
                 onFailure: function()
                 {... },
                 onSuccess: function(response)
                 {
                   $(container).set('html',response);
                   $('divCierre').setStyle('visibility', 'visible');
                 }
           }).send();
 }

This function works fine where there's no more than de involved divs
in the page, but when I try to use it in the "production" page, I get
always the error predefined in onFailure method.

The pages are XHTML 1.0 transitional valids, same as css files

Any idea?

Thanks in advance