Thanks again! Here is my working sort code:

function CircleRadiusSortFunc( crvA, crvB )
{
    if ( crvA.conicRadius < crvB.conicRadius )
        return -1;
    else if ( crvA.conicRadius > crvB.conicRadius )
        return 1;
    else
        return 0;
}



for ( var i = 0; i < curves.length; i++ )
{
     if( curves.item(i).isCircle )
          array_of_curves.push( curves.item(i) );
}
	
debug( "unsorted" );
for (var i = 0, len = array_of_curves.length; i < len; i++) 
{
     debug( round( array_of_curves[i].conicRadius * 2, decimals ) );
}

array_of_curves.sort( CircleRadiusSortFunc );

debug( "sorted" );
for (var i = 0, len = array_of_curves.length; i < len; i++) 
{
     debug( round( array_of_curves[i].conicRadius * 2, decimals ) );
}

>Len