Do I need to pay Service Tax?

Hi

I am working as an individual software development professional for a Foriegn company based in France and switzerland since July 2008 till date.

I recieved foreign payments in Euros (once or twice in a month) regularly since then and they were deposited into my account as Indian Rupees after conversion with appropriate exchange rate.

The only work that I did for them was "software development only". I don't do maintainence, amc or any other kind of supporting jobs.

I have recieved an amount greater than 10 lacs during this time period of my assignment, so my question is, DO I NEED TO PAY ANY SERVICE TAX??? Yes/No? Why and How?

Thanks a Lot.

Akshaya