关于mysql_insert_id的有关问题

关于mysql_insert_id的问题
$lastid=mysql_insert_id(); 
  $query="insert into 'mywesite'.'word'('id','word') values('".$lastid."','".$word."')"; 
这样是不是不对？
一直这样说：
Warning: mysql_insert_id() [function.mysql-insert-id]: A link to the server could not be established in F:\xampp\htdocs\my website\add_url.php on line 50


[解决办法]

PHP code

<?php    mysql_connect("localhost", "mysql_user", "mysql_password") or        die("Could not connect: " . mysql_error());    mysql_select_db("mydb");    mysql_query("INSERT INTO mytable (product) values ('kossu')");    printf ("Last inserted record has id %d\n", mysql_insert_id());?>