echo "
  <tr><td>
 <table border=\"1\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\">
 <form action=\"\" method=\"post\" name=\"\" >
 <tr style=\"border: solid 1px #000\">
  <td style=\"background-color:#537BF1\"><b>Номер</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Офис</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Представитель</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Телефон</b></td>
  <td>Галочка</td>
 </tr>";

for($i = 0; $i < $num; $i++)
{
 echo "<tr>";
echo"<td style=\"background-color:#B7D4FF\"><a href=forms/fr_office.php?id=".$postrow[$i]['id'].">".$postrow[$i]['id']."</a></td>";

echo "
                 <td bgcolor=\"ffffff\">".$postrow[$i]['office']."</td>
                 <td style=\"background-color:#B7D4FF\">".$postrow[$i]['predstavitel']."</td>
                  <td style=\"background-color:ffffff\">".$postrow[$i]['tel']."</td>
                  <td><input type=\"checkbox\" name=\"selected\" value=".$postrow[$i]['id']."></td>
       </tr>";
}
echo "</table> <input type=\"submit\" name=\"vvod\" value=\"Выбрать\"/>
                 </form>
                 ";

echo '<pre>' . print_r($_POST, 1) . '</pre>';

foreach($_POST['selected'] as $selected){
....
}

if(isset($_POST['selected']))

... WHERE `id` IN ('.implode(',', $_POST['selected']).')

if(isset($_POST['selected']))


foreach($_POST['selected'] as $selected){
....
}

<?php

//тут коннект к базе

$query="SELECT from $table WHERE `id` IN ('.implode(',', $_POST['selected']).')";

mysql_query($query);

echo ".....

$query="SELECT from `".$table."` WHERE `id` IN ('".implode(',', $_POST['selected'])."')";

<?php
// Устанавливаем соединение с базой данных
include "config.php";

$query="SELECT from otpravki WHERE `id` IN ('".implode(',', $_POST['selected'])."')";
echo $query;
mysql_query($query);

?>

$items = array_map('intval', array_keys($_POST['selected']));
$query="SELECT * from otpravki WHERE `id` IN ('".implode(',', $items)."')";

if (isset($_POST['selected']) && is_array($_POST['selected'])) 

<?php
// Устанавливаем соединение с базой данных
include "config.php";
if (isset($_POST['selected']) && is_array($_POST['selected'])) {
$items = array_map('intval', array_keys($_POST['selected']));
$query="SELECT * from otpravki WHERE `id` IN ('".implode(',', $items)."')";
echo $query;
$result=mysql_query($query);}

while($row = mysql_fetch_assoc($result)){
    echo '<tr><td>'.implode('</td><td>', $row).'</td></tr>';
    }
?>

SELECT * from otpravki WHERE `id` IN (1,2)

 echo '<tr><td>'.implode('<br>', $row).'</td><td><input type="checkbox" name="selected['.$row['id'].']" ></td></tr>';

<?php
// Устанавливаем соединение с базой данных
include "config.php";

$query="SELECT * FROM otpravki";
$result=mysql_query($query);

echo"
 <table border=\"1\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\">
 <form action=\"selected.php\" method=\"post\" name=\"\" >
 <tr style=\"border: solid 1px #000\">
  <td style=\"background-color:#537BF1\"><b>Номер</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Офис</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Представитель</b></td>
  <td style=\"background-color:#537BF1\" align=\"center\"><b>Телефон</b></td>
  <td>Галочка</td>
 </tr>";
while($row = mysql_fetch_assoc($result)){
    echo '<tr><td>'.$row['id'].'</td><td>'.$row['office'].'</td><td>'.$row['predstavitel'].'</td><td>'.$row['tel'].'</td><td><input type="checkbox" name="selected['.$row['id'].']" ></td></tr>';
   
        }

echo "</table> <input type=\"submit\" name=\"vvod\" value=\"Выбрать\"/>
                 </form>
             

<?php
// Устанавливаем соединение с базой данных
include "config.php";

//проверка на существование массива
if (isset($_POST['selected']) && is_array($_POST['selected'])) {

//что-то...
$items = array_map('intval', array_keys($_POST['selected']));

//что в $items
//echo $items;

//запрос
$query="SELECT `office`,`predstavitel`,`tel` from otpravki WHERE `id` IN (".implode(',', $items).")";

//показываем, что летит в запрос
//echo $query;

//делаем запрос, а результат в $result
$result=mysql_query($query);

echo "
<html>
<head>
         <link rel=\"stylesheet\" type=\"text/css\" media=\"print\" href=\"css/print.css\" />
 </head>
 <body>

<table border='1' cellpadding='2' cellspacing='0'>";

while($row = mysql_fetch_assoc($result)){
    echo '<tr><td height=130  width=450><h1>'.implode('<br>', $row).'</h1></td><td width=450> </td></tr>';

    }
    }
echo "</table></body></html>";

//ВОТ ТУТ БЕДА

else {
echo "Pusto!";
}
?>
<div class="noprint"><INPUT TYPE="button" VALUE="Распечатать" onClick=location.href="javaScript:window.print();"></div>