var win = null;

           function NewWindow(mypage,myname,w,h,scroll)
            {
             LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
             TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
             settings = "height="+h+",width="+w+",top="+TopPosition+
                 ",left="+LeftPosition+",scrollbars="+scroll+",resizable=no";
             win = window.open(mypage,myname,settings);
             if (win.window.focus)
              {
               win.window.focus();
              }
            }