public static void swapElements(Vector someVector, int indexOne, int indexTwo) {
		
		// size is useful
		int size = someVector.size() ;
		
		// validate parameters
		// also leave in identity case
		if (	(someVector == null) || 
			(indexOne < 0) || (indexOne >= size)||
			(indexTwo < 0) || (indexTwo >= size)||
			(indexOne == indexTwo)	)
			{
			return ;
		} // end if
		
		// grab element one
		Object elementOne = someVector.get(indexOne) ;
		
		// set element two in its place
		someVector.set(indexOne, someVector.get(indexTwo)) ;
		
		// set it in element two's place
		someVector.set(indexTwo, elementOne) ;
		
		// done
		return ;
		
	} // end method swapElements