_width and _height, how it works?

[vakarm]

Why when i execute this script :

if (_root.mcPict._width<400){
_root.mcPict._width=_root.mcPict._width+5;
}

When i execute this, the height of my movie clip is changing too, is somebody can explain me what is appening.


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thanks
merci

[Pilot_22]

Well....basically I can tell you it´s keeping its aspect ratio.