Following a line with 2 line followers?

Hi,

I am using easyC and am trying to follow a line using 2 line followers right next to each other. I have seen this done before, I am just not sure how to program this in for autonomous. Can anyone help me out? Thanks.

Sample the surface values at power up.
Subtract those values from the normally returned values.
This should make the sensors return 0 on the surface the robot is powered up on.
Import the drive library
Set Speed to around 30 and rotation to leftsensor + right sensor.