conditional onload;file=

I am having trouble with a conditional onload. I am using this statement:

This is not producing the desired result. It seems that it does the first onload statement regardless of the value of [var.conf.orientation].
I am trying to get a section of my template to change depending on the value of my [var.conf.orientation] variable. Am I going about this the wrong way?

I resolved this by assigning the desired file name to a variable and passing that to the onload function.

'where' is a parameter for block.
For a single fields, use parameter 'if'.

And it is not 'where' but 'when'.