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	webPage.add(new AbstractAjaxTimerBehavior(duration) {
		private static final long serialVersionUID = 1L;

		/**
		 * {@inheritDoc}
		 */
		@Override
		public final CharSequence getCallbackUrl(final boolean onlyTargetActivePage) {
			return super.getCallbackUrl(onlyTargetActivePage)) + "&pos=" + window.pos";
		}

		/**
		 * {@inheritDoc}
		 */
		@Override
		protected final void onTimer(final AjaxRequestTarget target) {
			final String pos = getRequest().getParameter("pos");
			// process pos ...
		}
	});