How can I hide the bar behind the lockscreen slider?

[ChezDigital]

I've searched all over and found so many tweaks that do everything but this, but I know it's possible because it was done by whomever posted under MrBrad on the second item on this page - http://www.cultofmac.com/217593/10-...ens-that-will-make-you-drool-contest-winners/

I got the status bar transparent (though it looks like crap in google searches and in chrome), but I can't find anything to make the lock slider bg transparent.

Does anyone know if this is just a single image that I can make transparent myself? I could do that if I knew the file name.

Thanks everyone in advance for your valuable knowledge.