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function getJsFile(url, callBack){

var XH = window.XMLHttpRequest ? new XMLHttpRequest : new ActiveXObject('Msxml2.XMLHTTP');

XH.open('get',url,true);

XH.onreadystatechange = function(){

if(XH.readyState == 4 && XH.status == 200){

if(window.execScript) window.execScript(XH.responseText);

else eval.call(window, XH.responseText);

eval(callBack)();

}

}

XH.send('');

}