wap, and php problem

Hey guys, I seem to have a problem that I cannot figure out.
I am not sure whether this is an wml, or php problem, but here it goes...

<?php
header("Content-Type: text/vnd.wap.wml;charset=utf-8");
echo "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";
echo "<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\""
. " \"http://www.wapforum.org/DTD/wml_1.1.xml\">\n";

echo "<wml>\n";
echo "<template><onevent type='onenterbackward'><refresh><setvar name='search1' value=''/></refresh></onevent><onevent type='onenterforward'><refresh><setvar name='search1' value=''/></refresh></onevent></template>";
echo "<card id='Home' title='ISBN'>\n";
$search1 = (isset($_POST['search']) ? $_POST['search'] : '');
$sl = strlen($search1);
if ($sl < 10 && $sl > 0) { $search1 = str_pad($search1, 10, 'x', STR_PAD_RIGHT); }
echo "<p>ISBN (omit"X"):</p>";
echo "<p><input type='text' name='search1' format='*N'/></p>";
echo "<p><anchor title='Fetch'>Fetch<go href='http://localhost/wap/istlib.php' method='post'>";
echo "<postfield name='search' value='$(search1)'/>\n";
echo "</go></anchor></p>\n";
echo "</card>\n";
echo "</wml>\n"; ?>

This seems to be the hotspot of the problem...
echo "<postfield name='search' value='$(search1)'/>\n";
now the script functions as it should for the most part, except for utilizing the str_pad function, which I really need to work.
but I know that php needs the variable to be as such $search1, but that causes a wml error.
If anyone can help, I would be greatful!

sorry, here is the formated version