Salve a tutti,

Sto riscontrando un problema con un sistema login.

Il codice questo:

Parte relativa al Login processes.php:
codice:
class Login_Process {

	var $cookie_user = CKIEUS;
	var $cookie_pass = CKIEPS;

	function connect_db() {
		$conn_str = mysql_connect(DBHOST, DBUSER, DBPASS);
		mysql_select_db(DBNAME, $conn_str) or die ('Could not select Database.');
	}
Parte relativa al login index.php
codice:
<?php
include_once 'include/processes.php';
$Login_Process = new Login_Process;
$Login_Process->check_login($_GET['page']);
$Login = $Login_Process->log_in($_POST['user'], $_POST['pass'], $_POST['remember'], $_POST['page'], $_POST['submit']); 
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>BiserHosting Pannello IRCD</title>
<link href="login-box.css" rel="stylesheet" type="text/css" />
</head>
<body background="images/sfondo.jpeg" />
<body>
<center>
<div style="padding: 100px 0 0 0px;">
<div id="login-box">
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" >
<H2>[img]images/logo.png[/img]</H2>
<div class="red"><?php echo $Login; ?></div>
<div id="login-box-name" style="margin-top:15px;">Username:</div><div id="login-box-field" style="margin-top:20px;"><input name="user" type="text" class="field" id="user"/></div>
<div id="login-box-name">Password:</div><div id="login-box-field"><input name="pass" type="password" class="field" id="pass" value="" /></div>
<input name="page" type="hidden" value="<? echo $_GET['page']; ?>" />
<input name="remember" type="checkbox" value="true" />RicordamiPassword Dimenticata?
</br></br>
<input name="submit" type="image" src="images/login-btn.png" class="button" width="103" height="42" style="margin-left:90px;" value="Log In" />
</form>
</center>
</div>
</div>
</body>
</html>

Lo script funziona perfettamente con Chrome , cosa invece che non succede ne con Explorer ne con Firefox, con i quali non si riesce ad effettuare il login.