Cross-domain Ajax call gets no element found Location: moz-nullprincipal

I am trying to invoke a cross-domain web service through jquery call $.ajax() The service returns

<?xml version="1.0" encoding="utf-8"?>
<double xmlns="http://www.webserviceX.NET/">1.4248</double>

If I specify dataType xml (or not specifying anything - jquery guesses correctly), I am getting XML Parsing Error: no element found Location: moz-nullprincipal:{4030734c-b902-4251-9067-1d1b5b15fc72} Line Number 1, Column 1: error (looks like nothing is coming back from the service). However, if I specify dataType jso开发者_StackOverflownp or script - I can see in firebug that everything is coming back correctly; however jquery apparently tries to eval the results and gives me corresponding error (missing semicolon or similar).

Is there a way in jQuery to enable cross-domain call and not evaluate it?

Notes:

1. I know that the fallback option is to call a program on my server that will invoke the web service and return the result to the browser;
2. I did specify crossDomain: true. It doesn't seem to make any difference.
3. "error" function does get invoked. But instead of original value "data" contains "parseerror".

Cross domain ajax is only allowed for JSONP, not XML

In JQuery 1.5 they added the crossDomain:true parameter which simply appends a ?callback=> value to the url. If you set that parameter, you must also set dataType:'json'. The cross-domain URL must also support JSONP and be serving up your expected data as such.