[php]
$comic_id = $_GET[‘id’]; // Get variable from URL
if(is_numeric($comic_id)){ // Good check for SQL Injections
$comic_url = “http://whatsshakincomic.com/comics/”.”{$comic_id}”.”.jpg”; // Build URL
if(@file_get_contents($comic_url)){ // If the file exists.
echo “HTML FOR COMIC”; // Return the html
}
}

[/php]