[jQuery] $.get and $.getJSON

[jQuery] $.get and $.getJSON


Hi,
i encounter problems with the getJSON method
when i do that:
$.getJSON("http://localhost/jas/www/rmt.php5?action=airport_state",
{country: $(this).val()}, function(json)
{
    $.log(json);
});
nothing happends. there is even no connection trace in firebug
but
$.get("http://localhost/jas/www/rmt.php5?action=airport_state",
{country: $(this).val()}, function(json)
{
    eval("var a = "+json);
    $.log(a);
});
works fine
php sends header("Content-type: application/json");
so thats fine to.
jquery version is 1.2.2
Any suggestions?
Martin