Be sure you spell the name of the TV the same way it's spelled in the tag.
Try these options for the TV:
Input Type: Radio Options
Input Option Values: header1||header2||header3
Default value: @INHERIT header1
Output Type: default
If you have names for the images, you can also do the Input Option Values like this:
Bird Photo==header1||Lake Photo==header2||Mountain Photo==header3
Using @INHERIT header1 means that the TV's value will be inherited from the parent, so you only have to set it in the parent document and all the children will get the value. It also makes header1 the default image in case you forget to set one.