function centerPopupLocation(popup_url,popup_name,popup_with,popup_height,reopen,myScrollbar,myLeftPos,myTopPos) {
  if(!myLeftPos)  {myLeftPos    = 5;}
  if(!myTopPos)   {myTopPos     = 15;}
  if(!myScrollbar){myScrollbar  = 0;}
  var popup_left                = (window.screen.width/2)  - (popup_with/2 + myLeftPos);
  var popup_top                 = (window.screen.height/2) - (popup_height/2 + myTopPos);
  if ((typeof popup_window != 'object') || (typeof popup_window == 'object' && popup_window.closed)) {
    if (document.all) {
      var xyPos                 = 'left=' + popup_left + ',top=' + popup_top;
    } else {
      var xyPos                 = 'screenX=' + popup_left + ',screenY=' + popup_top;
    }
    popup_window                = window.open(popup_url, popup_name, "toolbar=no,location=yes,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width=" + popup_with + ",height=" + popup_height + ",copyhistory=no," + xyPos + "");
    popup_window.opener         = self;
    popup_window.focus();
    winUrl                      = popup_url;
    windowWidth                 = popup_with;
    windowHeight                = popup_height;
  } else {
    if ((winUrl != popup_url) || reopen) {
      popup_window.location.href = popup_url;
    }
    if ((windowWidth + windowHeight > 0) && (popup_with != windowWidth || popup_height != windowHeight || myLeftPos != diffWidth || myTopPos != diffHeight)) {
      var newWidth              = popup_with  - windowWidth;
      var newHeight             = popup_height - windowHeight;
      popup_window.resizeBy(newWidth,newHeight);
      popup_window.moveTo(popup_left,popup_top);
    }
    popup_window.focus();
    winUrl                      = popup_url;
    windowWidth                 = popup_with;
    windowHeight                = popup_height;
  }
  diffWidth                     = myLeftPos;
  diffHeight                    = myTopPos;
}