code: function initReversedTiles() {
  	var low, high, tile, reversed,
  		result = new Uint16Array( 0x10000 );
  		
  	for ( low = 0; low < 0x100; low++ ) {
  		for ( high = 0; high < 0x100; high++ ) {
  			tile = ( low << 8 ) | high;
  			reversed = ( reverseByte( low ) << 8 ) | reverseByte( high );
  			result[ tile ] = reversed;
  		}
  	}
  
  	return result;
  }
docs: Initialize lookup table for reverseTile().