Registration Form in PHP

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PHP

Hi,

I have two php documents first one is reg.php, it has connection string and insert query to the database and in the other php document signup.php, it has one textbox as first name and signup CSS button. Once press the sign up button, error occurred as Undefined index: firstname, kindly advise me how to get signup.php firstname textbox data to the reg.php?

Your soonest response is highly appreciated.

reg.php
//connection string is working properly
$connection = mysql_connect($host,$dbuser,$dbpass);
$db = mysql_select_db($dbname, $connection);
$firstName_txt = $_GET['firstname'];
$sql = "INSERT INTO Test (Rock) VALUES ($firstName_txt)";
$result = mysql_query($sql);
echo "Thank you";


signup.php
<form name="reg" method="POST" action="reg.php">
<input type="text" name="firstname" id="firstname2" style="font-family:'Myriad Pro';font-size:16px"/>
<div id="cssButton"> <a href="reg.php" class="button custom">Sign Up</a></div>
</form>

[Edited Question]
Now the problem is typed value is not going to the database, always going 1 as a value.

reg.php
//connection string is working properly
$connection = mysql_connect($host,$dbuser,$dbpass);
$db = mysql_select_db($dbname, $connection);
$firstName_txt = isset($_POST['firstname']);
$sql = "INSERT INTO Test (Rock) VALUES ($firstName_txt)";
$result = mysql_query($sql);
echo "Thank you";

signup.php
<form name="reg" method="POST" action="reg.php">
<input type="submit" name="POST" value="Register"/>
</form>