/*
 *  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.7.0',
        'Msxml2.XMLHTTP.6.0',
        '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");
}