var arr;
var option;


function srcChange(val)
{
var subcategory = document.getElementById("subcategory");


switch (val)
{
case "Airtime":
arr = new Array("Airtime loading, Balance inquiry ","Denomination and validity ","Credit transfer ","E top up ");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;


case "Tariffs":
arr = new Array("Call charges ","Tariff plans","Call history ");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;


case "Handsets":
arr = new Array("Handset assistance","PUK ","Faulty phones ","Stolen phones ");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Orange offers":
arr = new Array("Phones on offer","Prepaid connection fees  ","Orange product catalogue ");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Value added services":
arr = new Array("GPRS","Sms and Sms info","Multimedia services (MMS)","Ring back tunes (CRBT)");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Network":
arr = new Array("Coverage","Dropped calls ","Poor signal");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Roaming":
arr = new Array("Roaming Partners","Post paid","Prepaid","Charges");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Post paid":
arr = new Array("Connection costs","Billing ","Getting connected");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;

case "Orange distribution network":
arr = new Array("Orange care centres","Dealers shops","Distribution Coverage");
subcategory.disabled = false;
for (var i=0;i<arr.length;i++) {
option = new Option(arr[i],arr[i]);
subcategory.options[i] = option;
}
break;


default:
subcategory.disabled = false;
subcategory.options.length = 0;
break;
}
}