PHP MYSQL error with regard to syntax

See more:

PHP

MySQL

I get this error code when I run the code below: Parse error: syntax error, unexpected T_STRING in /home/a7120106/public_html/checklogin.php on line 3

include("dbconfig/dbconfig.php")
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name");
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);
$count=mysql_num_rows($result);
if($count==1){
session_register("myusername");
session_register("mypassword");
header("location:http://www.pixidian.net/");
}
else {
echo "Wrong Username or Password";
}

and dbconfig contains this:

$host="mysql15.000webhost.com";
$db_name="a7120106_*****";
$username="a7120106_*****";
$password="*****";
$tbl_name="members";