Вот сам код

<sup>function get_cat ( selected ) {
document.form1.ch_sel.options.length = null;
document.form1.static_s.options.length = null;
message = document.getElementById('nameCheckFailed');
url = "./?cat=ajax&cat_id=" + selected;
loadXMLDoc(url);
}

function loadXMLDoc(url) {

// branch for native XMLHttpRequest object
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send(null);
// branch for IE/Windows ActiveX version
} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send();
}
}
}

function processReqChange()
{
// only if req shows "complete"
if (req.readyState == 4) {
alert ( req.status );
// only if "OK"
if (req.status == 200) {
alert (req.status);
// ...processing statements go here...
response = req.responseXML.documentElement;
len = response.getElementsByTagName('value').length;
alert (len);
for ( i=0; i < len; i++) {
val = response.getElementsByTagName('value') .firstChild.data;
text = response.getElementsByTagName('text').firstChild.data;
document.form1.static_s.options = new Option (text,value);
}
} else {
alert("There was a problem retrieving the XML data:\n" + req.statusText);
}
}
}</sup>

Сорри, не то нажал, и не дописал

вот хмл данные
<?xml version="1.0" encoding="UTF-8" ?>
- <response>
<val>89583</val>
<txt>89583</txt>
<val>89779</val>
<txt>89779</txt>
<val>89629</val>
<txt>89629</txt>
<val>89729</val>
<txt>89729</txt>
<val>89759</val>
<txt>89759</txt>
<val>87241</val>
<txt>87241</txt>
<val>92375</val>
<txt>92375</txt>
<val>92394</val>
<txt>92394</txt>
<val>89755</val>
<txt>89755</txt>
<val>89757</val>
<txt>89757</txt>
<val>87929</val>
<txt>87929</txt>
<val>87853</val>
<txt>87853</txt>
<val>92373</val>
<txt>92373</txt>
<val>92396</val>
<txt>92396</txt>
<val>89798</val>
<txt>89798</txt>
<val>89780</val>
<txt>89780</txt>
<val>89942</val>
<txt>89942</txt>
<val>89943</val>
<txt>89943</txt>
<val>92369</val>
<txt>92369</txt>
<val>92290</val>
<txt>92290</txt>
<val>86035</val>
<txt>86035</txt>
<val>89941</val>
<txt>89941</txt>
<val>89939</val>
<txt>89939</txt>
<val>92289</val>
<txt>92289</txt>
<val>89938</val>
<txt>89938</txt>
<val>89528</val>
<txt>89528</txt>
<val>89530</val>
<txt>89530</txt>
<val>89777</val>
<txt>89777</txt>
</response>

выводит ошибку, что response null. Что не так?