Okay

I have a Members feature on my Community System, when you click a member it returns as only the members name, not any of the other members.

But I want it to when clicked to display some information from a MySQL Database

Iv tried this code but it doesn't display anything!!

Code:
<!-- Copyright Jacob Clark 2010 | Fusion Strike Studios and Network -->
<!-- Fusion Strike; Live! Was Developed In Loving Memory Of Frederick Clark -->
<!-- Please Do Not Remove These Comments -->

<?php 
include "config.php";
?>


<html>
<head>
<title>Fusion Strike; Live!</title>
<link rel="stylesheet" href="style.css" type="text/css" >
</head>
<body>
<img src="images/logo.png">
<br>
<div id="page-wrap">

	<h4>
		<?php include "bloginfo.php"; ?>
	
	</h4>

<h6>

	<?php include "navigation.php"; ?></div></h6>

<div id="page-wrap">
	
	<?php
	//Defines the function that will allow us to display only one post on click
	
	function get_content($id = '') {

	//Gets the ID number from the SQL Database
	if($id !=""):
		$id = mysql_real_escape_string($id);
		$sql = "SELECT * FROM regusers where id = '$id'";
	else:
		//If we dont specifiy an ID display everything
		$sql = "SELECT * FROM regusers ";
	endif;
	//If there was an error display it
	$res = mysql_query($sql) or die(mysql_error());
	
	//This IF statment decides wether the ID tag you have enterd exists or not, if it does it
	//displays the post, if it doesnt it displays an error message
	
	if(mysql_num_rows($res) != 0):
	
	//How to display the posts
	while($row = mysql_fetch_assoc($res)) {
		//Makes posts titles into links
		echo '<p><a href="members.php?id=' . $row['id'] . '">' . $row['username'] . '</a></p>';
		
	}
	
	else:
		echo '<p>Oh Dear, This Is Embarrassing, It seems we cant find what your looking for!</p>';
	endif;
	
	

	
	}
	
//Ends Our Class

//Displays the posts
	if(isset($_GET['id'])):
		get_content($_GET['id']);
		$id = ($_GET['id']);
		
		$sql = "SELECT * FROM regusers where aboutme = '$id'";
		$res = mysql_query($sql) or die(mysql_error());
		$row = mysql_fetch_assoc($res)or die(mysql_error());
		echo $row['aboutme'];
		
		
		
		else: 
			get_content();
	$result = mysql_query("SELECT * FROM regusers");
	$num_rows = mysql_num_rows($result);
	echo "<h6>We have <b>$num_rows</b> registerd members</h6>";



			endif;
	?>
	
	
</div>
<br>	
		<?php include "footer.php"; ?>
Anybody got any ideas?

Thanks!!!!