can't call the servlet using AJAX

I create some javascript to send some search request.
However, on some machines i wont' be able to send
request. What could be the reason?

function sendSearchRequest()
{
var srch_url = "/servlet/Search";
try {
request = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
request = null;
}
}
}

request.open('GET', srch_url , true );
request.onreadystatechange = GetSearchResponse;
request.send(null);
}

function GetSearchResponse()
{}

sk said the following on 7/18/2006 6:34 PM:Several.

The browser doesn't support the HTTPRequest Object.
The browser doesn't allow ActiveX.
You are using limited HTTPRequest code.
If the browser doesn't support Msml2.XMLHTTP or Microsoft.XMLHTTP then
your code fails silently. There are MSIE's with other versions of
XMLHTTP support and no non-IE browser supports your code.

--
Randy
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