how keep session between pages

Afte reading about this top I have done the following, put

if (!seesion_id()) {
  session_start();
}

at the top of the wp-config file

I also have the following code on a wp page

if (isset($_session["user"])) {
    doit("yes ");
    doit($_session["user"]->ScreenName);
  }
  else {
    doit("no session");
    $_session["user"] = new userClass;
  }

the function doit() simply displays the paramater on the page.

I am always getting “no session” so obviously session is not working.

Anyone has any ideas?

With normal php you always put session_start() top of every page but with wp you don’t so is that a problem here??

Thanks