What wrong with my Query??

["HarryG" <harry1980@xxxxxxxxx>]

What the hell is wrong with this MYSQL query?? PHP keeps giving me the error message:

You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'limit=20000, name='test1', email='atest@xxxxxxxx', password='t 

$query = "INSERT INTO mfadmin SET id='', account='$accname_lc', limit=$plans, name='$yourname', email='$email', password='$password', lastlogin='$datetoday', datecreated='$datetoday', expiry='$expirydate', lastip=123.123.123.123";
   
This is my table structure
CREATE TABLE `admin` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `account` varchar(50) NOT NULL default '',
  `limit` int(10) unsigned NOT NULL default '0',
  `name` varchar(50) NOT NULL default '',
  `email` varchar(50) NOT NULL default '',
  `password` varchar(50) NOT NULL default '',
  `lastlogin` varchar(50) NOT NULL default '',
  `datecreated` varchar(50) NOT NULL default '',
  `expiry` varchar(50) NOT NULL default '',
  `lastip` varchar(50) NOT NULL default '',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM;