I had this problem with my webclient aswell, all i did to fix it was re-jared the client and removed excess stuff from the webclient.php document
when i rejared the client, i made sure i did it step by step again (not loading a previous made .JMS saved 1)
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>rename</title>
</head>
<body bgcolor="#000000">
<br/><br/><center>
<applet name="rename" width="765" height="503" archive="client.jar" code="client.class">
<param name="java_arguments" value="-Xmx500m">You do not have Java installed... Go google it >.<
</applet></center>
</html>
if that doesnt work, then let me know