Coffee Icon for rate

iin plugin Hyperatings under 

public_html/mod/hypeStarRating/graphics

there is a stars.gif

downloaded my a coffee icon from http://www.veryicon.com/icon/ico/Object/Office%20Space/Cup%20coffee.ico )

renamed it as stars.gif and uploaded. asks to rewright the file click yes.

all seems good. reload Cpanel no changes. visit site, stars are still..stars. 

and stars.gif shows the origional file, mine is nowhere to be seen.

how do i make my stars, coffee icons?