function GetXmlHttpObject(handler) { 
    var objXmlHttp=null
    
    if (window.XMLHttpRequest) {
        objXmlHttp=new XMLHttpRequest()
        objXmlHttp.onload=handler
        objXmlHttp.onerror=handler
        objXmlHttp.onreadystatechange = handler
        return objXmlHttp
    } else if (window.ActiveXObject) {
        var strName="Msxml2.XMLHTTP"
        if (navigator.appVersion.indexOf("MSIE 5.5")>=0) {
        strName="Microsoft.XMLHTTP"
        } 
        try { 
            objXmlHttp=new ActiveXObject(strName)
            objXmlHttp.onreadystatechange=handler 
            return objXmlHttp
        } 
        catch(e) { 
            alert("Error. Scripting for ActiveX might be disabled") 
            return 
        } 
    } 
}