Logging in and setting sessions

alright, this is a big screwy problem that I am trying to fix. The first thing is that I have a global php document loading into all php documents. The code is as follows:

<?php
session_start(); 
if(isset($_SESSION['username']))
 { 
header("Location: index.php"); exit();
include_once("connect.php");

//checking if sessions are set.
if(isset($_SESSION['username'])){
$session_username = $_SESSION['username'];
$session_pass = $_SESSION['pass'];
$session_id = $_SESSION['id'];

//check if the member exists
$query = mysql_query("SELECT * FROM clients WHERE id='$session_id' AND password='$session_pass'LIMIT 1") or die("Could not check member");
$count_count = mysql_num_rows($query);
if($count_count > 0){
//logged in stuff here
$logged = 1;

}else{
header("Location: logout.php");
exit();
}
}else if(isset($_COOKIE['id_cookie'])){
$session_id = $_COOKIE['id_cookie'];
$sessions_pass = $_COOKIE['pass_cookie'];


//check if the member exists
$query = mysql_query("SELECT * FROM clients WHERE id='$session_id' AND password='$session_pass'LIMIT 1") or die("Could not check member");
$count_count = mysql_num_rows($query);
if($count_count > 0){
while($row= mysql_fetch_array($query)){
$session_username = $row['username'];
}

//create sessions
$_SESSION['username']=$session_username;
$_SESSION['id']=$session_id;
$_SESSION['pass']=$session_pass;

//logged in stuff here
$logged = 1;

}else{
header("Location: logout.php");
exit();
}
}else{
//if the user is not logged in
$logged = 0;
}


 }



?>

Now this page is loaded into my log-in page here:

<?php include_once("scripts/global.php");

if(isset($_POST['email'])){
$email = $_POST['email'];
$pass = $_POST['pass'];
$remember = $_POST['remember'];

//error handeling 
if((!$email)||(!$pass)){
$message = 'Please insert both fields';
}else{
// secure the data
$email = mysql_real_escape_string($email);
$pass = sha1($pass);
$query = mysql_query("SELECT * FROM clients WHERE email='$email' AND password='$pass' LIMIT 1" ) or die("Could not check member");
$count_query = mysql_num_rows($query);
if($count_query == 0){
$message = 'The information you entered is incorrect';
}else{
//start session
$_SESSION['pass'] = $pass;
while($row = mysql_fetch_array($query)){
$username = $_row['username'];
$id = $row['id'];
}
$_SESSION['username'] = $username;
$_SESSION['id'] = $id;
if($remember == "yes"){
//create cookies
setcookie("id_cookie",$id,time()+60*60*24*100,"/");
setcookie("pass_cookie",$pass,time()+60*60*24*100,"/");
}

header("Location: home.php");






}
}
}

?>

Now the first error is that I get is:

Warning: mysql_real_escape_string(): No such file or directory in /misc/12/000/267/023/7/login.php on line 13

Warning: mysql_real_escape_string(): A link to the server could not be established in /misc/12/000/267/023/7/login.php on line 13

Warning: mysql_query(): No such file or directory in /misc/12/000/267/023/7/login.php on line 15

Warning: mysql_query(): A link to the server could not be established in /misc/12/000/267/023/7/login.php on line 15
Could not check member

Now in result when I dont have global.php loaded and have connect.php loaded.- logging in works but there is no session set and the information from their row in the table is not available. 

Thanks