//usage

/*
<select name="il" onchange="ayarla(this.form)">
	<option selected="selected" value="EPDM">EPDM</option> 
	<option value="NBR">NBR</option>
	<option value="NR">NR</option> 
	<option value="NR/BR">NR/BR</option> 
	<option value="NR/SBR">NR/SBR</option> 
	<option value="SBR">SBR</option> 
	<option value="SBR/BR">SBR/BR</option>
</select>

<select name="ilce" onchange="">
	<option value="">İlçe seçiniz.</option>
</select>
*/

/*
var Depo = {
	'EPDM': ['40','50','55','60','70'],
	'NBR': ['70','78','80'],
	'NR': ['35','65'],
	'NR/BR': ['40','45','50','55','60','65','70','72','75','80'],
	'NR/SBR': ['55'],
	'SBR': ['60'],
	'SBR/BR': ['60']
}*/
function ayarla(form) {
var c1 = form.il, c2 = form.ilce, i;
var hepsiniTemizle = function() {
for(i = c2.options.length-1; i > 0 ; i--)
c2.options[i] = null;
};
var seciliHaleGetir = function() {
c2.options[0].selected = true;
};

if(!c1.value) { // 'İl seçiniz' kısmı seçilidir
hepsiniTemizle();
c2.options[0] = new Option('İlçe seçiniz.', '')
seciliHaleGetir();
return;
}

hepsiniTemizle();
for(i = 0; i < Depo[c1.value].length; i++)
c2.options[i] = new Option(Depo[c1.value][i], Depo[c1.value][i]);
seciliHaleGetir();
}