Duplicating Multiple Movie Clips

programming flash
1

Hello im using flash 8
Ok so I went through a tute on the site which explained this code

dupMovie = function () { 
for (i=0; i<100; i++) { 
circle.duplicateMovieClip("circle"+i, i, {_x:Math.random()*600, _y:Math.random()*600, _alpha:Math.random()*50}); 
with (eval("circle"+i)) { 
_xscale = _yscale=Math.random()*300; 
} 
} 
}; 
dupMovie();

I know movie clips cant live at the same depth, and the tute breifly touches on useing getNextHighestDepth(). However im not familar with that parameter.

This is what im doing wrong

dupMovie = function () { 
for (i=0; i<100; i++) { 
circle.duplicateMovieClip("circle"+i, i, {_x:Math.random()*600, _y:Math.random()*600, _alpha:Math.random()*50}); 
with (eval("circle"+i)) { 
_xscale = _yscale=Math.random()*300; 
} 
} 
}; 
dupMovie();
//
dupMovie2 = function () { 
for (i2=0; i2<100; i2++) { 
circle2.duplicateMovieClip("circle"+i2, i2, {_x:Math.random()*600, _y:Math.random()*600, _alpha:Math.random()*50}); 
with (eval("circle2"+i2)) { 
_xscale = _yscale=Math.random()*300; 
} 
} 
}; 
dupMovie2();

Any responce is welcome