<form id="form1" name="form1" method="post" action="edit.php">
   
   team: <input type="text" name="team" /><br />
    <br>
        <?php
    $sql = 'SELECT * From team';
    $con = mysql_connect("localhost","root","talk21") or die;
    $result = mysql_db_query(lastr, $sql); 
       while ($rec = mysql_fetch_array($result)) 
    {
       print "\n<input type='checkbox'  name=team[]' value='".$rec['id']."'checked> ".$rec['team']." </input>"; 
 }
 if(isset($_POST['submit'])){
  $q="delete from team"; //delete all the teams
  mysql_query($q);
  foreach($_POST['team'] as $value){
    $q="insert into team (team) values ('$value')";
mysql_query($q); //so by the end, the table will have records which were checked and all the records which were unchecked will be removed.
 }
}
//I list these teams in my form. 
$q="select id,team from table";
$res=mysql_query($q);
echo "<form method='post' action='check.php'>";
while($row=mysql_fetch_array($res)){
  echo "<input type='checkbox' name='team[]' value='$id' checked>".$team."<br />"; //this will list all the teams in the database
}
echo "<input type='submit' name='submit' value='submit'>";
echo "</form>";