Selection without selection bounds

Question

I'm using CS2 so I can't call on selection bounds (which seems to be the preferred method of working with selections)
var sb = activeDocument.selection.bounds;
var sbWidth = sb[2]-sb[0];
var sbHeight = sb[3]-sb[1];
alert(sbWidth + " , " + sbHeight)
So the above code won't work for me
How can I find out (1) if a selection is set (selection width & height = 0?) and (2) find the width and height of said selection assuming that only the rectangular marquee is used (not ellipse or lasso).
Cheers

Answer 1

I had to find out bounds of selection that could be any shape for my Photoshop Photo Collage Toolkit the selections are image size and shaped alpha channels in the Photo Collage Template PSD file with the names "Image 1", "Image 2", ..., "Image n".  I had a heck of a time to come up with a way that worked in CS2, CS3, Cs4 and CS5. After consulting with my good friend Rube Goldberg we can up with a contraption that seems to work. This is not a thing of beauty. Some local functions are not shown for the function name states what it does.
// Get Alpha Channel's width and height Selection Bounds did not work???
makeLayer(); // Make Temp Work Layer
loadAlpha("Image " + imageNumber ); // Load Image Alpha Channel
fillBlack();
activeDocument.selection.invert(); // Inverse
// If image size equals canvas size no pixels will be selected clear will fail
try{
activeDocument.selection.clear(); // One clear did not work
activeDocument.selection.clear(); // Two did the trick
}catch(e){}
activeDocument.selection.deselect(); // Deselect
var SB = activeDocument.activeLayer.bounds; // Get the bounds of the work layer
var SWidth = (SB[2].value) - (SB[0].value); // Area width
var SHeight = (SB[3].value) - (SB[1].value); // Area height
activeDocument.activeLayer.remove(); // Remove Work layer
Where there is a will there is a way. Layer bounds does work...
I needed these selections bounds so I could resize and align placed images to these mapping Alpha Channels and mask any Image overflow.
Link to my Photo Collage Toolkit