MysQL Error

<?php
 
/*
CREATE TABLE  `news`.`addnews` (
`id` INT NOT NULL ,
`author` VARCHAR( 255 ) NOT NULL ,
`title` VARCHAR( 255 ) NOT NULL ,
`content` LONGTEXT NOT NULL ,
PRIMARY KEY (  `id` )
) ENGINE = MYISAM ;
*/
$connect = mysql_connect("localhost","root","root")or die("Error 1") ;
$selectdb = mysql_select_db("news",$connect) or die("Error2");
 
$a = $_POST['author'];
$t = $_POST['title'];
$c = $_POST['content'];
 
if ( isset($_POST['add']) and $_POST['add'] == 'news' ) {
	$insert = mysql_query("INSERT INTO addnews (author,title,content) VALUES ('$a','$t','$c') ") or die ("MySQL Error");
	if ( isset($insert) ) {
		echo "Insert is Done :) Have a good day!";
	}
}
 
echo "
<form action='addnews.php' method='post'>
Author : <input type='text' name='author' /></br>
Title : <input type='text' name='title' /></br></br>
New Content : <textarea name='content'></textarea></br>
<input type='submit' value='Add New :)' />
<input type='hidden' name='add' value='news' />
</form>
";
 
mysql_close($connect);
 
?>