function gocat(id) {
  document.location = 'index.php?pg=list&keres_katid=' + id;
}

function gopro(id) {
  document.location = 'index.php?pg=view&termek_id=' + id;
}

function goman(id) {
  document.location = 'index.php?pg=list&keres_gyarto=' + id;
}

function goopt(opt) {
  document.location = 'index.php?pg=list&' + opt + '=1';
}