I have found a Jquery plugin
http://benalman.com/projects/jquery-bbq-plugin/It can easily change url params after # symbol without reloading page.
Will be good to add this into FengOffice and record all page-specific data in url:
http://demo.fengoffice.com/en/index.php?#c=task&a=view_task&id=11&project=123&tag=54&filter=user&filtervalue=51
instead of GET parameters:
http://demo.fengoffice.com/en/index.php?c=task&a=view_task&id=11
And after this changes we can implement direct urls to project pages, tabs, url with filter settings.