Actionscript to Javascript

Hello,

I´ve got the following code on Actionscript that I would like to write in Javascript. I´ll write my guess on what I think this code does.

// The first to lines set the element "mapa" on the specified  x and y coordinates

_root.mapa_mc.mapa._x = -450;

_root.mapa_mc.mapa._y = -250;

//The next four lines create four variables and initialize them.

_global.medidaX= 0;

_global.medidaY= 0;

_global.medidaXX= -450;

_global.medidaYY= -452;

//These two lines scale  the element  mapa as specified.

this.mapa._xscale=70;

this.mapa._yscale=70;

//This is to stop the timeline.

stop();