Someone

var somefunc = function(e) {
      var combotext = z.getComboText();
      if (e.keyCode == 13 && combotext != '')
      {
        //$.get("/drupaltest",{q: "uzlet/szallitolista/" + z.getSelectedText()}, szallito_lista);
        //$.get("/drupaltest/uzlet/szallitolista/",{name: name, sort: sort, order: order}, szallito_lista);
        szallitoload(z);
      }
    }


$(combo).keyup(somefunc);

somefunc({keyCode: 13}); --> i wanna call simulate here enter pressing