Help linking buttons to movie clips

hi.
I am making a full flash site for a friend of mine, but I encountered a problem whilst doing so. My problem is telling a button to go off and play a frame within a mc. I couldn’t work out how, so I tried to say on the first button:

on(press){
this.hello = 1;
}

and then withing the mc:

if(_root.hello ==1){
gotoAndStop(1);
}

and so on withing the rest of the buttons. But this didn’t work. I have attached a fla of a duplicate of what I am trying to do (I want to keep the actual site fla I am making hidden for obvious reasons).

Please help.
Thanks.