$_GET is not working with radio buttons - php

Question

Does anyone know why this code will not work? I simply want to print which radio button is selected. It always prints 'Null' no matter what is selected. PHP code is below.
<?php
$conn = mysql_connect('localhost','student','student') or die(mysql_error());
mysql_select_db('vgs',$conn);
//Get Question 1
if (isset($_GET["q1option"]))
{
$q1option = $_GET["q1option"];
}
else
{
$q1option = "Null";
}
//Process Question 1
echo "".$q1option;
The HTML code is below.
<form action="" method="get" >
<div id="Q1">
<label><input type="radio" name="q1option" value="Less_than_16" />Less than 16</label><br />
<label><input type="radio" name="q1option" value="16_or_more" />16 or more</label>
</div>
Any help with this would be greatly appreciated. Note I have many tables in the 'vgs' database, if that makes a difference.
Thank you,
Daniel
Additional Code
HTML below
<input type="button" value="Submit" onclick="result();" />
<input type="reset" value="Reset" />
</form>
Embedded JavaScript below. It uses http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js
function result()
{
$('#Suggestion').load('process_answers.php');
}

Answer 1

Looks like your submit button is outside of the <form> tag, it should be within the form:
<form action="" method="get" >
<div id="Q1">
<label><input type="radio" name="q1option" value="Less_than_16" />Less than 16</label><br />
<label><input type="radio" name="q1option" value="16_or_more" />16 or more</label>
</div>
<input type="submit" value="Submit" />
</form>

Answer 2

You are always getting Null in return because your query string is not being attached anywhere. If you are using AJAX, you need to pass the query string data. Your cycle is not working properly because of a misconfiguration.
Take the following code:
//Get Question 1
if (isset($_GET["q1option"]))
{
$q1option = $_GET["q1option"];
}
else
{
$q1option = "Null";
}
Using $_GET will attempt to extract from your query string a variable labeled 'q1option'. If this variable is not set, then return 'Null'. So your code is working as expected as it is currently structured.
If you want to pass the variable between pages you will either need to submit the form and the variable will be automatically passed, or you need to modify your jQuery to allow for the passing and processing behind the scenes of your variable. Once processed, you would then handle the results accordingly and render them to the client as desired.