Previous versions of sIFR allowed users to enter "sWmode: 'transparent'" to avoid the common problem of Flash objects being overlayed on regular HTML objects on screen, no matter the z-index of either elements.
How do I replicate this behavior in sIFR 3.0?
Indeed, you can use
wmode: 'transparent'
or
wmode: 'opaque'
But also
transparent: true
or
opaque: true
Whatever floats your boat :)
Do note that browsers usually have issues with transparent Flash movies, so usually specifying a background color is the better option.