function donate_shortcode( $atts, $content = null) {
    global $post;extract(shortcode_atts(array(
        'account' => 'your-paypal-email-address',
        'for' => $post->post_title,
        'onHover' => '',
    ), $atts));
    if(emptyempty($content)) $content='Make A Donation';
            return '<a href="https://www.paypal.com/cgi-bin/webscr?
$account.'&item_name=Donation for '.$for.'" title="'.$onHover.'">'.$content.'</a>';
}
add_shortcode('donate', 'donate_shortcode');