stl::list iterator troubles

Hi,

I have two nested for loops which look like this with my selfmade list 
implementation:

for (s****p *s = ****ps; s; s = s->next)
   for (s****p *s2 = s->next; s2; s2 = s2->next)
     {...}

Now how can I do this with stl lists and the iterators? The most 
difficult thing is the start of the inner loop.
My outer loop would look like this:

for (list<c****p>::iterator i****p = ****ps.begin(); i****p != ****ps.end(); 
++i****p)

But of course I can't begin the second loop with i****p->next.....

Any hints?

Regards
Philip