The more I could do is pointing you to sparkline's FAQ:
http://omnipotent.net/jquery.sparkline/#s-faq
Frequently Asked Questions
Why are there no axis labels/markers?
Sparklines are intended to be small enough to fit alongside a line of text, to give a quick impression of a trend or pattern and thus don't have the paraphernalia of full sized charts. As of version 2.0 you can mouse over the sparklines to see the underlying data.