I want to limit the creation of objects acording to the stage width.

My method is the following:

for (var i:int = 0; i<7; i++){  

If I put something like this, it won't work

for (var i:int = 0; i<(stage.width); i++){  

What I'm doing wrong?

Full code:

    [SWF(width = 350, height = 600, frameRate = 60)]  
import com.actionsnippet.qbox.*;  
var sim:QuickBox2D = new QuickBox2D(this);  
sim.createStageWalls();  
// make a heavy circle  
sim.addCircle({x:3, y:3, radius:0.4, density:1});  
// create a few platforms  

// make 26 dominoes  
for (var i:int = 0; i<7; i++){  
//End
     sim.addCircle({x:1 + i * 1.5, y:18, radius:0.1, density:0});
     sim.addCircle({x:2 + i * 1.5, y:17, radius:0.1, density:0});
     sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0});
     sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0});

//Mid end

      sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0});

}  
sim.start();  
sim.mouseDrag();