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;this.onreadystatechange=defaultEvent_onreadystatechange;

    // public method
    this.attachEvent=function(eventHandle,functionHandle){
        var eventHandle=String(eventHandle).toLowerCase();
        switch(eventHandle){
            case "onreadystatechange":
                if(this.onreadystatechange!=defaultEvent_onreadystatechange){
                    this.onreadystatechange=defaultEvent_onreadystatechange;
                    aryOnPropertyChange_AttachedEvents=new Array();
                }
                aryOnPropertyChange_AttachedEvents.push(functionHandle);
                return(true);
            break;
            default:
                return("Not reallized yet.");
            break;
        }
    }

    this.deleteRequestHeader=function(strName){
        delete aryRequestHeaders[strName];
    }

    this.detachEvent=function(eventHandle,functionHandle){
        var eventHandle=String(eventHandle).toLowerCase();
        switch(eventHandle){
            case "onreadystatechange":
                if(this.onreadystatechange!=defaultEvent_onreadystatechange){
                    this.onreadystatechange=defaultEvent_onreadystatechange;
                    aryOnPropertyChange_AttachedEvents=new Array();
                    return(true);