php - phpbb poll - Enlarge Images on hover -

i'm using phpbb forum software.

i have few images set of options in phpbb poll . display images using bbcode

[img] path image [/img] 

what when user hvers mouse on image, should enlarge

how can achieve ? tried few things - modifying css img in common.css , trying add styling img bbcode doesn't work...

any appreciated.

also there better way put images inside poll?

in css file includes styling image can have main style like

.poll_image { width: 50px; height: 50px } 

and on mouseover

.poll_image:hover { width: 100px; height: 100px } 

that should double width & height of image whilst mouse on it, go normal when moves out.