Texture at present only works for square terrain data.
Your stripe count when creating the terrain has tbe equal. Like 10 by 10 .
Use some tool , like Snagit, that allows you to screen grab an area
from a scanned map.
The area has be also square and the pixel count must be power of 2.
Like 256, or 512 or 1024 ... Correction, also 500 by 500 works.
Save the jpeg or gif in the SITES/sitename/IMAGES directory
In the code
Select the site
Press the Map Processing Button
select the scanned map file
use the < or > buttons to stretch the pixel image over the terrain
The value in the middle, is the amount of stretch, make it smaller to move the map less
Once you are happy with what you see, you can Save your work
And , if you want, make this map your default for next time when you load the site.
Terraserver Data from http://www.terraserver.com
Activate the Select Image Radio button
Choose your area
In the new window, click on the download button
Then ftp the tar file to a UNIX box, tar -xvf it, get the data back to your PC