Alright, I've been looking up and down this code a couple of times now. And I've read through yor tips several times...But I seem to be stuck a one point:
I've made the menu, but I don't understand how I'm supposed to make the links work...

This is the code so far (bear with me, it's messy cause I've been testing a lot):
Code:
<?php
	header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
	header("Cache-Control: no-cache");
	header("Pragma: no-cache");
?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<title>A PHP-Site</title>
	</head>

	<body>
	<?php
		echo "\t<center><h2>This page has a body of pure PHP</h2></center>\n";

		mysql_connect('localhost','root')
			|| die(mysql_error());
		@mysql_select_db(thorbear)
			|| die("Unable to select database");

		//Skriver ut alt i tabellen
		$query = mysql_query('SELECT * FROM gallery');
		$num_rows = mysql_num_rows($query);
		$i = 0;
		if ($num_rows == 0)
		{
			echo "<b>No galleries in database</b>";
		}
		else
		{
			while ($i < $num_rows)
			{
				$GID = mysql_result($query,$i,"GID");
				$name = mysql_result($query,$i,"name");
				echo "\n\t\t<a href=\"purePHP.php?\$galleryid=$GID\">$name</a><br />";
				$i++;
			}//while
		}

		$query2 = mysql_query("SELECT * FROM image WHERE GID = '$galleryid'");
		$num_rows2 = mysql_num_rows($query2);
		$i2 = 0;
		if ($num_rows2 == 0)
		{
			echo "<b>No images in selected gallery</b>";
		}
		else
		{
			while($i2 < $num_rows2)
			{
				$ImID = mysql_result($query2,$i2,'ImID');
				$alt =	mysql_result($query2,$i2,'alt');
				$adress =	mysql_result($query2,$i2,'adress');
				echo "\n\t\t<img src=\"$adress\" alt=\"$alt\">";
				$i2++;
			} // while
		}

		mysql_free_result($query);
		mysql_free_result($query2);
		//Lukker koblingen til databasen
		mysql_close();

		echo "\n\t\t<p>&copy; Thorbear Incognito</p>\n";
	?>
	</body>
</html>
I now have a database with 2 tables 'gallery' and 'image' where gallery contains GID (GalleryID) and name, image contains ImID (ImageID), GID, adr (filepath) and alt (alt name).