In the first case for the design advance you to do nothing. Count and pay his employer has. If the advance is repaid, it is considered a violation of labor laws and equal to the delay of cash payments.
There is a second method. If the advance is paid to salary is still far, and the money you need urgently, you can draw up advance.
You need to write a statement about the design you advance, sign it at the head of the Junior level and to assure the head of the company, include a signed statement to the accounting Department.
You place your down payment. It cannot be more than the amount you earned prior to this time period. That is, calculate how much you earn the amount of additional advance, calculates it has already received advance payment, take the tax payment amount for meals in the dining room (if your organization is provided). The remaining amount you can make in advance.