It should work just using it as a css rule
.vb { display:none }
On a side note, if none of the article content is changing and you are only flipping the code, then it might be better UX design to make each of the code blocks a tabbed interface. Yes it will mean duplicating the buttons but it will make a lot more sense to the end user and will be more immediately available. You will notice that most coding sites will do this if they show examples for more than one language.
And another note: most users don't like it when you change the scroll bars of the window frame. Most people find it similar to marquee and blink and if you notice your scroll bar disappears when you hover/drag it which makes it extra frustrating.