threads with member functions

[xixpsychoxix]

this is probably a stupid question with either a really easy answer or an "are u kidding? that can't be done!!!" answer, but how do i use _beginthread with a class member function? i've tried:

class my_class
{
 void function_1 (void)
 {
  cout << "Hello, world!";
 }
};

int main ()
{
 my_class test;

 _beginthread (my_class.function_1, 0, NULL);

 return 0;
}

to no avail. can anyone tell me how to achieve this?