<?php

if ($_GET['ch'] == 'lub') {
   ?>
<select name="cityList">
<option value="gw">Gorzow Wlkp</option>
<option value="skw">Skwierzyna</option>
</select>

<?php
}


if ($_GET['ch'] == 'zach') {
   ?>
<select name="cityList">
<option value="zs">Szczecin</option>
<option value="kosz">Koszalin</option>
<option value="star">Stargard</option>

</select>

<?php

}


if ($_GET['ch'] == 'wiel') {
   ?>
<select name="cityList">
<option value="poz">Poznan</option>


</select>

<?php

}
?>