Get .ajax post responsetext?

Get .ajax post responsetext?

Hi guys, I can't get any response text from my AJAX POST Request:

My code is:

$.ajax({
type: "POST",
url: "includes/ajax/ajax_makepp.php",
data: dataString,
success: function(dataString) {  }
});   


I've checked my dataString is correct and the server files actions are being executed I just need to see the resulttext to debug things.

I have tried:

var resposne = $.ajax({
...
}).responseText;

As per the JQUERY SITE but the var has nothing in it...