<form id="urlap" action="test.php" method="post">

	<p><label for="asd">Valami:</label> <input type="text" name="asd" id="asd" value="adat" /></p>

	<p><input type="submit" name="submit" id="submit" value="Küld" /></p>

</form>

function sendForm(form) {

	postdata = $(form).serialize();

	$.post($(form).attr('action'), postdata, function(retdata) {

		alert('Success! Returning data:\n'+retdata);

	});

}

$(document).ready(function() {

	$('#submit').click(function() {

		sendForm('#urlap');

		return false;

	});

});