<?php
$page = file_get_contents('http://agentquery.com/agent.aspx?agentid=13');
// name will be inside a span ctl00_Agent1_lblName, store it in $agent_name
preg_match("/<span id=\"ctl00_Agent1_lblName\".*span>/", $page, $agent_name);
// display agent name matches
print_r($agent_name);