AS2 - Tween class CENTER?

[TNan]

I'm familiar with using the Tween class...however, is there a "easy" way to center a mc using tween class...

i know using:

..."_x", regular, 0, 20, 0, true)...

will position the image to the X=20...however what is the best way to center the mc on the screen (horizantally) using tween class...

not even sure if there is a way...thanks in advance

[gparis]

var myCenter:Number = (Stage.width - mc._width)/2;

..."_x", regular, 0, myCenter, 0, true)...

gparis