/*    Copyright 2006 Christian Gross http://www.devspace.com    From the book Ajax Patterns and Best Practices   Licensed under the Apache License, Version 2.0 (the "License");   you may not use this file except in compliance with the License.   You may obtain a copy of the License at       http://www.apache.org/licenses/LICENSE-2.0   Unless required by applicable law or agreed to in writing, software   distributed under the License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   See the License for the specific language governing permissions and   limitations under the License.*/function FactoryXMLHttpRequest() {    if( window.XMLHttpRequest) {        return new XMLHttpRequest();    }    else if( window.ActiveXObject) {        var msxmls = new Array(            'Msxml2.XMLHTTP.5.0',            'Msxml2.XMLHTTP.4.0',            'Msxml2.XMLHTTP.3.0',            'Msxml2.XMLHTTP',            'Microsoft.XMLHTTP');        for (var i = 0; i < msxmls.length; i++) {            try {                return new ActiveXObject(msxmls[i]);            } catch (e) {            }        }    }    throw new Error( "Could not instantiate factory");}