Variable to track position in timeline

Hi guys, I am trying to create a variable in Actionscript 2 that will record the position in the timeline, so Flash knows the user's last position on the timeline.
The first line in the mc is:
var portfoliostate;
On frame 20 of the timeline, I have the following actionscript:
portfoliostate = "1_portfolio";
When a button is clicked, I want Flash to recognise if the user has been on frame 20 or not. The code on the button is:
this.onRelease = function() {
if (portfoliostate="1_portfolio") {
_root.gotoAndStop(90);
else {
_root.gotoAndStop(80);
However it does not seem to be working. I am implementing this correctly?
Many thanks

You need to use == when comparing, = when assigning
if (portfoliostate=="1_portfolio") {

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