Hi Donna,
The taxes they are responsible for as far as payroll tax is concerned is dependent on the deductions the employee makes to some extent, meaning if they are claiming single 1 or married 3. Some of the taxes the employer pays is based on matching what the employee pays. Other taxes such as FUTA, SS and State Unemployment are based on specific rates. FUTA is .8% with a cap at $7000, in NY State Unemployment is 5% but varies from state to state.
Social security is 6.2% with an annual limit of $102,000, Medicare is 1.45%
Here is a link to a paycheck calculator that may help you:
http://www.paycheckcity.com/
Hope this helps.
Kim