求php4连接mysql5不成功原因?

求php4连接mysql5不成功是什么原因呀?以下是报错内容:
Warning: mysql_connect() [function.mysql-connect]: Client does not support authentication protocol requested by server; consider upgrading MySQL client in /usr/wwwroot/testphp.php on line 2
失败!
Warning: mysql_close(): no MySQL-Link resource supplied in /usr/wwwroot/testphp.php on line 5

求解决方法?

http://jjdai.zhupiter.com/2010/10/%E5%B0%87mysql%E5%8D%87%E7%B4%9A%E6%88%904-1%E7%89%88%E9%81%87%E5%88%B0-warning-mysql_connect-function-mysql-connect-client-does-not-support-authentication-protocol-requested-by-server-consid/

http://club.phpe.net/index.php?s=2ca088f315e3121f22c20cd3209b53df&act=Print&client=printer&f=2&t=8792

哈哈，又看到club.phpe.net的外联了！
不是要关了么？