[jQuery] autocomplete

[MC]

I'm trying to use autocomplete on a dialog windows that has a editing
form for the user to change data previously saved so every
autocomplete input has data that can be change. The problem is when i
do change a value and try to update an input with part of the data
returned by the autocomplete script.

This is what i am doing but is not working

$.ajax({
         type: "POST",
         url: "contabilidad/totalAsientos.php",
         data: "idasiento="+id,
         success: function(respuesta){
                                     var totallineas = parseInt
(respuesta);
                                    for(var j=0; j<totallineas; j++){
                                       $
("#codigocuenta"+j).autocomplete("contabilidad/
autocompleteasiento.php" ,{
                                            minChars: 1,
                                            width: 400,
                                            max: 20,
                                            autoFill:
true
                                        }).result(function(event,
data, formatted) {
                                            if (data!=""){
                                                    $
("#codigocuenta"+j).val(data[1]);
                                                    $
("#denominacion"+j).val(data[2]);
                                        }
                                        });

                                    } //endfor
                                }
            })

Is there a way to do what a want to do?