fix opening tag help in firefox

seems like clicking the inspector taginfo help has never worked in firefox, for some reason the click event is never fired on an anchor tag. Also, 0751dc4ba16a1e5990f4c62244226b590f8de40e left the anchor tag without an href (kinda funny, i guess the link actually should be there for semantic purposes). 

Anyways, removing the anchor and attaching the onclick to the button entity seems to work across all browsers. I am not a cross-browser expert so someone else should spot check this