[UPDATE]Suppressed multi popup & added function handlePageUpdate()

The maps in index.html & map-online.html display the same pop up.


added function handlePageUpdate():
/*
 * Handles the pages dynamic refresh.
 * If it detects the offline mode, the reload process is not triggered.
 * Handled pages:
 * /index.html
 * /data-filtered-all.html
 * /data-raw-all.html
 * /charts.html
 * /map-online.html
 * If the page is not handled, throws an error.
 */
[UPDATE] *.html use now handlePageUpdate().