Adaptive button for quick scrolling to top of the page and to the last position

button-controlhtml-css-javascripttop-button

AnthonyAxenov 80a05222aa INITIAL COMMIT		2016-09-24 23:43:59 +08:00
upbtn.css	INITIAL COMMIT	2016-09-24 23:43:59 +08:00
upbtn.js	INITIAL COMMIT	2016-09-24 23:43:59 +08:00
upbtn.png	INITIAL COMMIT	2016-09-24 23:43:59 +08:00