<?php
require_once('nusoap/lib/nusoap.php');
$w = "http://monkey.cs.kent.edu/%7Epwang/php/convert.php";
$client = new soap_client($w);
$param = array('infix' => $expr,  'browser' => $br, 'simplify' => $simp );
$result = $client->call('convert', $param);
echo "$result";
?>