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        req.open('GET', url, false);
        req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
        req.send('');
        return req.responseText;
    },
    
    /**
     * Try XHR methods in order and store XHR factory.
     *
     * @return <Function> XHR function or equivalent
     */
    createXMLHTTPObject: function() {
        var xmlhttp, XMLHttpFactories = [
            function() {
                return new XMLHttpRequest();
            }, function() {
                return new ActiveXObject('Msxml2.XMLHTTP');
            }, function() {
                return new ActiveXObject('Msxml3.XMLHTTP');
            }, function() {
                return new ActiveXObject('Microsoft.XMLHTTP');
            }
        ];
        for (var i = 0; i < XMLHttpFactories.length; i++) {
            try {
                xmlhttp = XMLHttpFactories[i]();
                // Use memoization to cache the factory
                this.createXMLHTTPObject = XMLHttpFactories[i];
                return xmlhttp;
            } catch (e) {}
        }
    },

    /**
     * Given a URL, check if it is in the same domain (so we can get the source
     * via Ajax).
     *
     * @param url <String> source url
     * @return False if we need a cross-domain request
     */
    isSameDomain: function(url) {
        return url.indexOf(location.hostname) !== -1;
    },
    
    /**
     * Get source code from given URL if in the same domain.
     *
     * @param url <String> JS source URL
     * @return <Array> Array of source code lines
     */
    getSource: function(url) {
        if (!(url in this.sourceCache)) {
            this.sourceCache[url] = this.ajax(url).split('\n');
        }
        return this.sourceCache[url];
    },
    
    guessFunctions: function(stack) {
        for (var i = 0; i < stack.length; ++i) {
            var reStack = /\{anonymous\}\(.*\)@(\w+:\/\/([\-\w\.]+)+(:\d+)?[^:]+):(\d+):?(\d+)?/;
            var frame = stack[i], m = reStack.exec(frame);
            if (m) {
                var file = m[1], lineno = m[4]; //m[7] is character position in Chrome
                if (file && this.isSameDomain(file) && lineno) {
                    var functionName = this.guessFunctionName(file, lineno);
                    stack[i] = frame.replace('{anonymous}', functionName);
                }
            }
        }
        return stack;
    },
    
    guessFunctionName: function(url, lineNo) {
		var ret;
        try {
            ret = this.guessFunctionNameFromLines(lineNo, this.getSource(url));
        } catch (e) {
            ret = 'getSource failed with url: ' + url + ', exception: ' + e.toString();
        }
		return ret;
    },
    
    guessFunctionNameFromLines: function(lineNo, source) {
        var reFunctionArgNames = /function ([^(]*)\(([^)]*)\)/;
        var reGuessFunction = /['"]?([0-9A-Za-z_]+)['"]?\s*[:=]\s*(function|eval|new Function)/;
        // Walk backwards from the first line in the function until we find the line which
        // matches the pattern above, which is the function definition
        var line = "", maxLines = 10;
        for (var i = 0; i < maxLines; ++i) {
            line = source[lineNo - i] + line;
            if (line !== undefined) {
                var m = reGuessFunction.exec(line);
                if (m && m[1]) {
                    return m[1];
                } else {
                    m = reFunctionArgNames.exec(line);
                    if (m && m[1]) {
                        return m[1];
                    }
                }
            }
        }
        return '(?)';
    }
};