Ajax validation

Hi again! I have been trying to validate an input against a data_read array in order to prevent a duplicate, so far what has given me the best result is this javascript:
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jQuery("#nem").blur(function() {
  var clientx = jQuery("select#client option:checked").val();
  var nemx = jQuery("#nem").val();

  jQuery.ajax({
    url: '{url:search}',
    data: {cliente:clientx, nem:nemx},
    success: function(result){
    }
  });
});

​
The data_read is in an event called search with a php block in the "found" event, with a "return true;"
Everything works fine except that the ajax result is the whole html of the form page, when all I need is that "true" or "false" response...
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How do I access that value from the js?
​
Also is there any other way to achieve this in CF? I'm aware that I could use a "jQuery.fn.form.settings.rules.customfn" but so far this way has given better results.
​
Thanks in advance!!!

hey Healy! Thanks for your answer! How did you get to that? I read the manual and the faqs and its the first time I see that tvout thing... what does it mean?

Searching through the forums and harassing Bob for help. Don't know what it means or what the other options are haha.

Thanks mate, so simple yet so beautiful, works like a charm!