<form method="post">
Input text: <input type="text" onkeyup="ajaxFunction1();" name="in1" id="in1">
ajax result: <input type="text" name="out1" id="out1">
</form>
$(document).ready(function(){
function ajaxFunction1(){
var data = $("#in1").val();
$.ajax({
type: "POST",
url: "test.php",
data: "intext="+data,
success: function(msg){
$("#out1").text(msg);
}
});
}
});
а так ?