You need to show the the tax deducted by your employer in TDS not in advance tax
No you don't need to else it will lead to double counting.
Since the tax has already been deposited against your PAN no., the IT department already has all the data with them. You need not worry about it.
The details in form 16 is merely for your reference so that you can verify against form 26AS. You can see actually how much tax was paid to the Govt and when. You should check it out. Here is an article about it http://www.investmentyogi.com/taxes/how-to-view-your-tax-credit-form-26as.aspx