Flash :: Rotate An Isometic View?

I'm creating a view of isometric tiles using this simple nested loop:

const TILE_WIDTH:Number = 180;
const TILE_HEIGHT:Number = 90;
for( var i:Number = 0; i < 10; i++ ){
for( var j:Number = 0; j < 10; j++ ){

[Code].....

This arranges the tiles nicely but I need to rotate the map at 90 degree intervals. I don't need to move any tile's x,y positions (As that would screw up depth sorting), rather just select a different frame using the 2d array of label strings.