Advice? How to Tag?

[eluser]georgerobbo[/eluser]
I am looking to add tags to my posts. I know you should have a different table for tags and posts. However I am unsure how to link the two?

My database structure is as follows.

Code:

--
-- Table structure for table `post`
--

CREATE TABLE IF NOT EXISTS `post` (
  `ID` int(11) NOT NULL auto_increment,
  `title` varchar(25) NOT NULL,
  `permalink` varchar(50) NOT NULL,
  `author` varchar(25) NOT NULL,
  `username` varchar(25) NOT NULL,
  `date` date NOT NULL,
  `time` time NOT NULL,
  `filename` varchar(25) NOT NULL,
  `description` varchar(200) NOT NULL,
  `category` varchar(25) NOT NULL,
  PRIMARY KEY  (`ID`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;