Code:
 formRequest : function(form, uri, cb, data, isUpload, sslUri){
     new Ajax.Request(uri, {
         method: 'POST', 
-        parameters: Form.serialize(form, true)+(data?'&'+data:''),
+        parameters: Form.serialize(form)+(data?'&'+data:''),
         timeout: cb.timeout,
         onSuccess: createSuccess(cb),
         onFailure: createFailure(cb)
     });
 },