Pointless Taxi Texture

This is my very first mod for GTA 4, so don't expect much...
It simply replaces the adverts on top of the taxis with a sign that reads 'The GTA logo. To remind you it's not real.' and an image of the GTA 4 logo next to it.
I know it's very simple. But I'm a beginner. I know it's not of any use to anyone in particular, but like I said it's my very first mod. I've been using photoshop for a while, and I wanted to test out texture modding. :)
Like I said, I know it's not really of any particular use to anyone, but I have to start somewhere xD
Thanks :)