NRI.Besides Salary income also have short term capital gain.Tax liability, forms and challans for e remittance

I am working in Middle East since April-2007. My current salary is INR.12 Lakhs per annum and is totally non taxable.
Apart from above income, I have made a short term capital gain of about INR 2.5 Lakhs by trading in Indian stock markets in this fiscal year so far.

My annual savings includes the following.

1. Public provident Fund1.00 Lakh
2. LIC premium0.60 Lakh
3. LIC Pension scheme premium0.10 Lakh
4. Tax saver ULIP 0.78 Lakh

My queries are:

1.What is my present tax liability?
2.If there is any liability, how and where do I remit the tax?
3.Which form is to be used for filling the return?