// Prep user input for storage - XSS cleanup
function xss_input($input) { 
    $input = trim($input); 
    if (!get_magic_quotes_gpc()) { 
        return addslashes($input); 
    } 
    return $input; 
} 

// Prep user inputed data for viewing in html page, textbox, or textarea
function xss_output($output) { 
    $output = stripslashes($output); 
    return htmlspecialchars($output); 
}