    //-----------------------------------------------------------------------------
    // 화면의 중앙으로 팝업창 띄우기..
    // @return : null
    // ex) ntPopUpCenter(경로, 팝업창이름, 넓이, 높이);
    //-----------------------------------------------------------------------------
    function ntPopUpCenter(url, wName, width, height, scrollYN) { //화면의 중앙
      // statusbar=no, menubar=no, scroll=no
        
        var LeftPosition = (screen.width/2) - (width/2);
        var TopPosition  = (screen.height/2) - (height/2);
        var win          = window.open(url, wName, "left="+LeftPosition+",top="+TopPosition+",width="+width+",height="+height+", scrollbars="+scrollYN);

        if(win == null){
            alert("팝업차단을 해제해주세요!");
        } else{
            win.focus();
        }
    }