Thanks for the reply, but I'm not sure how exacly to do that.
Here's my problem in more detail:
I created a box, extruded the top of it and added a texture to the whole object - shown in part #1 of the image below.
Then I selected one of the new surfaces created from the extrude and opened the texture coordinate editor but it only allows me to select one pixel of the image - shown in part #2 of the image below.
Is there a way to display more than one pixel of the image onto the surface? Any help is much appreciated.