Specifying Initial Slide Show Image Display Size in QueryString

Call me a newbie. I'm trying to display my Gallery2 slide show in an Iframe. I cut and pasted the link to get into slide show mode in the album / subalbum I want, and pretty much have everything working.

Note: I'm not trying to EMBED on the server side. I'm trying to <IFRAME SRC='querystring'> on the client side.

But, I would like to preset the initial DELAY and MAX SIZE parameters to a specific size when the user clicks on the link. It intuitively seems that I should be able to control these with PARM=VALUE pairs on the QueryString.

Unfortunately, I can't find any reference to how to do this, and inspection of the underlying javascript did not immediately yield any clues.

Does anyone know how to do this, or can point me in the right direction to find the documentation on it?

Thanks,