question about layer

[matrix]

I'm using this function to move a clip around:

function move(clip clip, clip LClip, int start_frame,
\ int end_frame,
\ int centerX,
\ int centerY,
\ int center2X,
\ int center2Y)
{

return Animate(start_frame , end_frame, "layer", clip, LClip, "add", 255, centerX, centerY,
\ clip, LClip, "add", 255, center2X, center2Y)
}

clip=avisource("D:\clip.avi")
a=clip.trim(100,699).bicubicresize(140,100)
move(clip, a,100, 300, 94, -100, 94, 120)

I was wondering if I can have the layer's operation and level parameters, optional.
What I mean is, if not specified, use the default, wich would be "add",255, and if specified, use whatever you specify.

And if possible, what would the function look like?

[FuPP]

Function move(clip clip, clip LClip, int start_frame,
\ int end_frame,
\ int centerX,
\ int centerY,
\ int center2X,
\ int center2Y,
\ string "mode",
\ int "strength")

{
mode = default(mode,"add")
strength = default(strength,255)

return Animate(start_frame , end_frame, "layer", clip, LClip, mode, strength, centerX, centerY,
\ clip, LClip, mode, strength, center2X, center2Y)
}


Regards,
FuPP

[matrix]

Beautiful. Thank you.