Cursor When i right Click it doesnt hide cursor

Like i said i have made a simple cursor to go with my rpg game on my site (note sites down at the time still tweaking). When i right click the cursor shows up over my Custom cursor. This is part of a site so i cant keep the Mouse.hide(); code on during my movie or it looks really dumb.
okay if anyone could just give me a tutorial site that shows this becuase ive seen it in an ad, so i know its possible. thanks for the help.