Sessions ending after first page load

I've not idea why my sessions aren't... sticking. They work for the first page load, and then they stop working and I get asked to log back in!

This is my 'access.php' include file for protected pages. If you need any other information, lemme know.

IF (session_id() == '') {
	//if the login form has been submitted...
	IF (isset ($sub_login)) {
		$sql = "SELECT * FROM ".PREFIX."users WHERE `user_name` = \"$frm_name\" AND `password` = \"$frm_pass\"";
		$query = mysql_query($sql);
		IF (mysql_num_rows($query) == 1) {
			//put them into a session
			session_start();
			$_SESSION['username'] = $_POST['frm_name'];
			$_SESSION['password'] = $_POST['frm_password'];
		//if the user name and password aren't correct
		} else {
			//start the page and show the form
			$ext_title = "Incorrect Password";
			include (PATH.'includes/header.php');
			echo "<div id=\"content\">\n<b>Incorrect Password or Username</b>\n";
			echo "<br />The username and/or password you entered are incorrect. Please enter your user name and password again.\n";
			echo "<br /><form action=\"?\" method=\"POST\">\nUsername: <input type=\"text\" name=\"frm_name\" size=16>\n";
			echo "<br />Password: <input type=\"text\" name=\"frm_pass\" size=20>\n";
			echo "<br /><input type=\"submit\" value=\"Submit\" name=\"sub_login\"></form>\n";
			echo "</div>\n";
			include (PATH.'includes/footer.php');
			echo "</body>\n</html>";
			exit();
		}
	//if the login form hasn't been submitted
	} else {
		//start the page and show the form
		$ext_title = "Log in";
		include (PATH.'includes/header.php');
		echo "<div id=\"content\">\n<b>Login In Form</b>\n";
		echo "<br />Please enter your user name and password.\n";
		echo "<br /><form action=\"?\" method=\"POST\">\nUsername: <input type=\"text\" name=\"frm_name\" size=16>\n";
		echo "<br />Password: <input type=\"password\" name=\"frm_pass\" size=20>\n";
		echo "<br /><input type=\"submit\" value=\"Submit\" name=\"sub_login\"></form>\n";
		echo "</div>\n";
		include (PATH.'includes/footer.php');
		echo "</body>\n</html>";
		exit();
	}
}

PHP:

If you'd like to see what's happening for yourself ... Databank; password is admin and user name is Administrator. Log in that, then click on the 'Databank' link in the nav bar and you're asked to log back in :/

Thanks,
Shamess

 

i think you must first start session, and then check session id

 

session_start();

has to be on top of the document for the sessions to work (i think)

 

Yeah, they do >.< I comepletely forgot. Thanks!