public int getCurrentSectionNo(){
	if (isEmpty()) return  -1;
	int position = size()-1; 
	Enumeration en = positionMap.keys();
	Integer nextKey = null;
	Integer nextValue = null;
	while(en.hasMoreElements()){
		nextKey = (Integer)en.nextElement();
		nextValue = positionMap.get(nextKey);
		int v = nextValue.intValue();
		if (v == position){
			return nextKey.intValue();
		}
	}
	return 0;
}