public void setHeight()
		{
			int temp;

			if(children[0] == null)
				temp = -1;
			else
				temp = children[0].getHeight();

			if(children[1]!=null)
				if(children[1].getHeight()>temp)
					temp = children[1].getHeight();

			if(height == temp +1 && height != 0)
				return;
			height = temp+1;

			if(parent!=null)
				parent.setHeight();
		}