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function createXMLHttpRequest() {

if(window.XMLHttpRequest) {

XMLHttpReq = new XMLHttpRequest();

}

else if (window.ActiveXObject) {

try {

XMLHttpReq = new ActiveXObject( "Msxml2.XMLHTTP ");

} catch (e) {

try {

XMLHttpReq = new ActiveXObject( "Microsoft.XMLHTTP ");

} catch (e) {

alert( "create object fail ");

}

}

}

}