[snip]
Wouldn't that be what this code does:
<?PHP
if ($_SESSION['search'] != NULL){
echo "The search string is: <strong>$search</strong>.<BR>";
$qrow[]= mysql_query($qstring) or die(mysql_error());
$qresult = $qrow[0];
$num_rows = mysql_num_rows($qresult);
//display search form
echo "
<form action='search.php' method='GET'>
<label>Search:
<input type='text' name='search' id='search' />
</label>
<input type='submit' value='Go!' />
</form>";
$_SESSION['search'] = $_GET['search'];
?>
[/snip]
Looks like it should if the form is referring to PHP_SELF (search.php).
Do you have a seesion_start() at the top of the page?
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