Well, the reason you got 'Array' when you echo'ed $HTTP_POST_VARS is because $HTTP_POST_VARS is an array containing all of the posted variables. Try the following:
while(list($key, $value) = each($HTTP_POST_VARS))
echo "$key: $value<BR>";
that should show a list with the variable name: value for each of your posted variables. You then access these simply through $(variablename), for example, you need the info posted from a text box called "mytextbox", simply type echo $mytextbox ... this is basic stuff but I'm not sure if you were understanding it. Hope that helps!
Chris King