Text matte... something or other

Ok,
I need some basic help.
I've got a person riding a bike infront of a building... i want some text to appear as though its behind the person on the bike but infront of the building... like all those other commercials out there today... yep.
i'm using interlaced dv footage (which doesn't make a diffrence to the basic concept I know,) but just incase you have any tips for making my life easier, i thought i'd let you know.
Thanks in advance for your time and help,
Nevin

you're going to have to create a matte for the bike. a combination of rotoshapes. you may be able to take a section of the shot where there is no bike, and use it to create a difference matte to get you started (i think there's a good tutorial on that that comes with shake). no easy way around things like that.

Roto is fun

(In case the tone of my voice is not carried through this text medium, I said that 'Sarcastically').