Added dots element (for pagination); Disabling prev button in first page; Disabling next button in last page

## CSS for next, previous buttons

#tj_next, #tj_prev  {visibility:visible}
#tj_next.disabled, #tj_prev.disabled {visibility:hidden}

## CSS for dots elements:

#tj_dots { list-style-type:none;}
#tj_dots li        {display:inline-block;height:10px;width:10px;border-radius:50%;display:inline-block;border:1px solid black;background-color:rgb(200,200,200);}
#tj_dots li.active {border:1px solid white;background-color:rgb(100,100,100);}