How to invest in Indian Mutual Funds Online?

I am looking for an easy way to make investments in the best performing mutual funds from India.
Basically I want an online account that allows me to not only invest lumsum but gives me an ability to invest through SIPs – systematic investment plans in funds like: HDFC, KOTAK, ICICI, FIDELITY, SBI, HDFC, etc.

Can anyone let me know how can I buy/sell or purchase mutual funds units online and manage my investment solution completely online?