// Автономна Республіка Крим
var AK = new Array ()
AK [0] = ""
AK [1] = "Бахчисарайский район"
AK [2] = "Белогорский район"
AK [3] = "Джанкойский район"
AK [4] = "Кировский район"
AK [5] = "Красногвардейский район"
AK [6] = "Красноперекопский район"
AK [7] = "Ленинский район"
AK [8] = "Нижнегорский район"
и так далее........................................ ......

function Change_select1() { // Очищаем список
for (var c = 0; c < document.Form_name.region.options.length; c++) {
document.Form_name.region.options[c] = null;
c--; }
document.Form_name.region.options[0] = new Option ('');;
if (document.Form_name.area.value == 'AK' ||
document.Form_name.area.value == 'VN' ||
document.Form_name.area.value == 'VL' ||
document.Form_name.area.value == 'DP' ||
document.Form_name.area.value == 'DN' ||
document.Form_name.area.value == 'JT' ||
document.Form_name.area.value == 'ZK' ||
document.Form_name.area.value == 'ZP' ||
document.Form_name.area.value == 'IV' ||
document.Form_name.area.value == 'KV' ||
document.Form_name.area.value == 'KG' ||
document.Form_name.area.value == 'LG' ||
document.Form_name.area.value == 'LV' ||
document.Form_name.area.value == 'MK' ||
document.Form_name.area.value == 'OD' ||
document.Form_name.area.value == 'PT' ||
document.Form_name.area.value == 'RV' ||
document.Form_name.area.value == 'SM' ||
document.Form_name.area.value == 'TP' ||
document.Form_name.area.value == 'XK' ||
document.Form_name.area.value == 'XS' ||
document.Form_name.area.value == 'XM' ||
document.Form_name.area.value == 'CK' ||
document.Form_name.area.value == 'CV' ||
document.Form_name.area.value == 'CG') {
document.Form_name.region.disabled=false;
var sel_array1 = eval (document.Form_name.area.value)
for (var c = 0; c < sel_array1.length; c++) {
if (c > "0") { document.Form_name.region.options[c] = new Option (sel_array1 [c],document.Form_name.area.value+'_'+c);}
else if (c == "0") { document.Form_name.region.options[c] = new Option (sel_array1 [c],c);}
if (sel_array1 [c] == "") { document.Form_name.region.options[c].selected=true; }
}
} else {
document.Form_name.region.disabled=true;
}
}

<select STYLE="width: 200px" Name="area" onchange = "Change_select1()" onLoad = "Change_select1()">
<?
include('area.php');
?>
</select>