You have eecuted the query. Next you have to store the fetched row in a variable. Then u can proceed as follows...
<?php
$idvar=$_GET['id'];
$username="[username]";
$password="[password]";
$database="[database]";
$localhost="[localhost]";
mysql_connect($localhost,$username,$password);
@mysql_select_db($database);
$query="SELECT * FROM 'viewing_mod' WHERE id='$idvar'";
$result=mysql_query($query);
$row = mysql_fetch_assoc($result);
mysql_close();
echo ($result) ;
?>
<html>
<head>
<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
<title>Viewing Mod #<? echo ($idvar) ?></title>
</head>
<body style="color: rgb(255, 255, 255); background-color: rgb(0, 0, 0);"
link="#ff0000" vlink="#009900" alink="#ff6666">
<table cellpadding="2" cellspacing="2" border="1"
style="margin-left: auto; margin-right: auto; height: 100%; width: 600px; text-align: center; background-color: rgb(0, 0, 70);">
<tbody>
<tr>
<td style="vertical-align: top; height: 400px;"><img src="<?php echo $row['image'] ?>" ><br>
</td>
</tr>
<tr>
<td style="vertical-align: top;">By <?php $row['author'] ?><br>
</td>
</tr>
<tr>
<td style="vertical-align: top; height: 40%;"><?php $row['description'] ?><br>
</td>
</tr>
<tr>
<td style="vertical-align: top;"><?php $row['download'] ?><br>
</td>
</tr>
</tbody>
</table>
<br>
</body>
</html>
Any more doubts...always welcome...
Sumathi.