Accessing Smarty arrays

I want to get the width of the item's imageFrame in my theme's Album template (album.tpl), so the way I thought to do it was something like:

{$ImageFrameData.data.`$theme.albumFrame`.widthRR}

in this case, $theme.albumFrame = shadow, so what I want to get is the value of $ImageFrameData.data.shadow.widthRR, which is 7

I've tried everything I can think of, square-brackets and back-quotes in every combination, but I can't get the value, only a text string that is partly evalualted (eg Array.data.shadow.widthRR).

Any ideas? I assume I can do this in PHP, but everyone says to try to keep PHP out of the .tpl files, and this doesn't seem like it should be that hard to do....

I don't want to hard-code the imageFrame name into the smarty call, I'm looking to make something work for any frame used. I know how to get the frame name ($theme.params.albumFrame), my questions is how can I then use this in the call to get the width of the frame. In PHP you can do something like $array[$key_name] where $key_name is a variable containg the name of the array key you want to access, but I can't figure out how to do a similar thing with Smarty...

I just found a solution to this, not what you proposed though: The way to do it is to split it into 2 calls -

{assign var=frameType value=$theme.params.albumFrame}
{assign var=cellWidth value=$ImageFrameData.data.$frameType.widthRR}

I had thought I'd tried something like that before, but I guess not... Oh well, problem solved