<script language="javascript" type="text/javascript">
var req;

url="http://www.km.ru/news/rss.asp?code=fun";
req = false;
// branch for native XMLHttpRequest object
if(window.XMLHttpRequest) {
try {
req = new XMLHttpRequest();
} catch(e) {
req = false;
}
// branch for IE/Windows ActiveX version
} else if(window.ActiveXObject) {
try {
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
req = false;
}
}
}
alert(url); alert(req);
if(req) {

alert(url); // вот тут переменная url пропадает

reg.getAllResponseHeaders();
req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send("");
}

</script>

<script>
var req=false;
var url="http://www.km.ru/news/rss.asp?code=fun";

// branch for native XMLHttpRequest object
if(window.XMLHttpRequest)
{
try
{
req = new XMLHttpRequest();
}
catch(e)
{
req = false;
}

// branch for IE/Windows ActiveX version
}
else if(window.ActiveXObject)
{
try
{
req = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
try
{
req = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
req = false;
}
}
}

alert(url); alert(req);

if(req)
{
alert(url); // вот тут переменная url пропадает

try
{
req.getAllResponseHeaders();
}
catch (e)
{
}

req.onreadystatechange = processReqChange;
req.open("GET", url, true);
req.send("");
}
</script>