Array problem, dynamic fetching...

Hi,

data = new Array;

data.first = "hello";
trace (data.first);
// the trace returns hello

dynamic = first; // this will possible be different
trace (data.dynamic);
// the trace returns null when I want it to return hello

I've tried many ways and all fail soo here I am asking for help! How do I get the dynamic variable possible used in the fetching of the content of the array?

*Solved*

The solution was for me to use findValue in the array... The array consist of id and passwords and by placing the pw directly after the id then findValue of the id + 1 makes the index of the pw that is easy to use:
if (pw == array[pwindex])
{ a.s.o. }