Star tree

function tree(height, rightAlign)
    {
       var starArr = [String.fromCharCode(9733)]; // Unicode Star character, Opera renders it a little smaller than IE and FF
       var pad = String.fromCharCode(8195); //Ascii EM space
       var i;

       for(i = 1; i < height; i++)
       {
           starArr.push(starArr[i - 1] + starArr[i - 1]);
           pad += pad;
       }

       if(rightAlign)
       {
          for(i = 0; i < height; i++)
          {
             starArr[i] = pad.substr(starArr[i].length, pad.length - 1) + starArr[i];
          }
       }

       return starArr.join('\n');
    }

    alert(tree(4, true));