function carmesin_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
	if ($node->type != 'product') {
 	return;
	}
	switch($op) {
 	case 'view':
		if (!(!$a3 && $a4)) {
 		  break;
		}

		$js = 'msgbox("Hello World");';
		//drupal_add_js($js, 'inline');
		break;
	}
}