Trying to use PHP to send two variables to SQL query - php

Question

I'm sorry for such a basic question but I'm a bit stumped. I've been trying to build a basic website for a database I created that will graph the data. There are two variable lists that the user selects from and the data from this then is supposed to generate the requested information. However, I'm completely lost as to how to get the data selected from the list to appear in the results page. It will search under the 'country' variable, but not goods. I know that I'm probably doing something stupid, but I'm not sure what it is.
The code I'm using for the dropdown menus on the forms is as follows:
<form id="Country" name="Country" method="get" form action="/database/results_page.php"><table border="1">
<tr>
<td width="68">Name</td>
<td width="48"><span id="sprytextfield4">
<select name="selcountry" id="selcountry" title="<?php echo $row_rsCountrydropdown['']; ?>">
<?php
do {
?>
<option value="<?php echo $row_rsCountrydropdown['country']?>" <?php if($varcountry_rsexportsearch == $row_rsCountrydropdown['country']){echo 'selected';}?>><?php echo $row_rsCountrydropdown['country']?></option>
<?php
} while ($row_rsCountrydropdown = mysql_fetch_assoc($rsCountrydropdown));
$rows = mysql_num_rows($rsCountrydropdown);
if($rows > 0) {
mysql_data_seek($rsCountrydropdown, 0);
$row_rsCountrydropdown = mysql_fetch_assoc($rsCountrydropdown);
}
?>
</select>
<select name="selgoods" id="selgoods" title="<?php echo $row_rsGoodsdropdown['']; ?>">
<?php
do {
?>
<option value="<?php echo $row_rsGoodsdropdown['name']?>" <?php if($vargoods_rsexportsearch == $row_rsGoodsdropdown['name']){echo 'selected';}?>><?php echo $row_rsGoodsdropdown['name']?></option>
<?php
} while ($row_rsGoodsdropdown = mysql_fetch_assoc($rsGoodsdropdown));
$rows = mysql_num_rows($rsGoodsdropdown);
if($rows > 0) {
mysql_data_seek($rsGoodsdropdown, 0);
$row_rsGoodsdropdown = mysql_fetch_assoc($rsGoodsdropdown);
}
?>
</select>
</tr>
</table>
<input type="submit" name="submit" id="submit" value="Submit" onChange="row_rsCountrydropdown.submit()" />
</form>
and my SQL for the results page is as follows:
mysql_select_db($database_cork_normalised, $cork_normalised);
$query_query = "SELECT exports.trade_year, country_id.country, goods.name, exports.Cork FROM country_id, goods, exports WHERE country_id.country_id='varcountry' and goods.goods_id='vargoods'";
$query = mysql_query($query_query, $cork_normalised) or die(mysql_error());
$row_query = mysql_fetch_assoc($query);
$maxRows_query = 10;
$pageNum_query = 0;
if (isset($_GET['pageNum_query'])) {
$pageNum_query = $_GET['pageNum_query'];
}
$startRow_query = $pageNum_query * $maxRows_query;
$vargoods_query = "-1";
if (isset($_POST['selgoods'])) {
$vargoods_query = $_POST['selgoods'];
}
$varcountry_query = "-1";
if (isset($_POST['selcountry'])) {
$varcountry_query = $_POST['selcountry'];
}
If anyone could help I'd be really grateful, this is my first foray into PHP and I'm a bit lost in it.