Problems in my audio player (Tween)

I want to make a smooth movement when i click on anywhere in my seek bar.
So i come up with an tween which is below.
I have a mask called tbMask which is stays beside timeBar.

ActionScript Code:

new mx.transitions.Tween(timeBar, "_xscale", mx.transitions.easing.None.easeOut, 0 , tbMask._xmouse, 2, true);

So basically this would make timebar stretch to tBmask’s _xmouse which has same x (170).
But it dont! It exceeds about 50% where i clicked and go back to _xmouse.

Far from this problem, the anothers are;
I call this swf from my main swf. Tween function works when i try to view my main.swf but it dont work when i call player.swf from browser.

Any opinion appreciated.
Thanks
K