State Unemployment Insurance tax?

Hi

What is the Contribution Rate towards State Unemployment Insurance tax in US-Payroll .i.e is Tax type 7? Is it 6.8%? If it is 6.8% then the total 6.8% is contributed by Employee alone or both Employee and Employer ? Then what is the difference between tax type 7, Tax type 10(Employer Unemployment tax) and tax type 20(Employee Unemployment tax)? What is the relationship between Tax type 7, 10, 20 and IT 0209?

Regards

Rakesh