Multi-Step form set-up

I have an Application Form which I have split into 4 sections so I can display the process in 4 steps. I have put each section in its own form, all on the same page. So the way I want this to work is each time the user submits a section they are advanced to the next step. I have been trying to set this up using session variables. When the page loads. the value for a session variable named 'formStep'is set to 1. Step 1 of the form has a 'show region utility' round it which shows if the session formStep is equal to 1. I thought that each time the user clicks the next ( submit ) button I could trigger a session variable and set it to 2. and show Step 2 which has the 'show region utility for the same value. But the when the submit button is clicked it doesn't appear to update the session value.

Am I trying to achieve my multi-step form correctly?

Hope this makes sense.
Thanks in advance.

That sounds like a possible solution. If you attach a copy of the page you are working on, I might be able to spot the flaw in your logic.

So I have the session vraiable triggered before page load with the value of '1'. I have the first form in a show behaviour:

<?php
  if ("".$_SESSION['formStep']  ."" == "1") {  // WebAssist Show If
?>
    ....Form Markup
    <?php
  } // ("".$_SESSION['formStep']  ."" == "1")
?>

This works fine. So I then re-set the session when the form submits:

<?php
@session_start();
if(isset($_POST["submit_pcd"]) || isset($_POST["submit_pcd_x"]))     {
  $_SESSION["formStep"] = "2";
}
?>

But this doesn't seem to work. Is this wrong?
page attached!

After your insert, the page redirects back to itself... that causes the session variable to be reset. I think it will work if you change the trigger on the initial session variable set code from:

<?php

@session_start();

if("" === "")     {

  $_SESSION["formStep"] = "1";

}

?>

to:

<?php

@session_start();

if(!isset($_SESSION["formStep"]))     {

  $_SESSION["formStep"] = "1";

}

?>

That works .. thanks Ray