wiserver.h and "admin login"

Hello,
first of all sorry my english.
Please help me, how make relative secure admin login? I think something like:

                WiServer.print("<html><body>");
                WiServer.print("<form method=GET><input type=text name=password><input type=submit name=pasw_submit value=\"Submit\"></form>");
                WiServer.print("</body></html>");

Its possible use POST? or exist any function for auth?
thanks you very much.

i use asynclab wifi library and wifi shield with MRF24WB0MA.