I have a register form and when I fill everything in and go to the next page it gives me this 1 error.

Parse error: syntax error, unexpected '='in D:\Hosting\5476681\html\database.php on line 12. (Line 12 is town/city)

Code:
$firstname=mysql_real_escape_string($_POST['firstname']); //This value has to be the same as in the HTML form file
$lastname=mysql_real_escape_string($_POST['lastname']); //This value has to be the same as in the HTML form file
$email=mysql_real_escape_string($_POST['email']); //This value has to be the same as in the HTML form file
$address1=mysql_real_escape_string($_POST['address1']); //This value has to be the same as in the HTML form file
$town/city=mysql_real_escape_string($_POST['town/city']); //This value has to be the same as in the HTML form file
$state/county=mysql_real_escape_string($_POST['state/county']); //This value has to be the same as in the HTML form file
$zip/postcode=mysql_real_escape_string($_POST['zip/postcode']); //This value has to be the same as in the HTML form file
$country=mysql_real_escape_string($_POST['country']); //This value has to be the same as in the HTML form file
$month=mysql_real_escape_string($_POST['month']); //This value has to be the same as in the HTML form file
$day=mysql_real_escape_string($_POST['day']); //This value has to be the same as in the HTML form file
$year=mysql_real_escape_string($_POST['year']); //This value has to be the same as in the HTML form file
$question=mysql_real_escape_string($_POST['question']); //This value has to be the same as in the HTML form file
$answer=mysql_real_escape_string($_POST['answer']); //This value has to be the same as in the HTML form file
$username=mysql_real_escape_string($_POST['username']); //This value has to be the same as in the HTML form file
$password1=mysql_real_escape_string($_POST['password1']); //This value has to be the same as in the HTML form file
$password2=mysql_real_escape_string($_POST['password2']); //This value has to be the same as in the HTML form file