Animation with actionscript

i have cloud images trying move across stage @ constant speed on x axis.  want cloud movie load right side of stage , start over, moving right left repeatedly.  old code in actionscript 2.0:

 

onenterframe = function() {
cloud1_mc._x -= 1;
if (cloud1_mc._x + cloud1_mc._width / 2 < left)
  {
   cloud1_mc._x = 875;
   cloud1_mc._y = 30;
  }
};

 

does have idea of how in actionscript 3.0?

 

thanks!

here's clues...  first check out following posting...

 

http://forums.adobe.com/thread/714911?tstart=0

 

then, realize as3 not use underscores common object properties... such _x becomes x

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