I have been getting the same problem and finally dove into the problem with a bit of luck. Okay first remove the body onload statement line from the index.thtml file and save it off.
Text Formatted Code
Current code used in Professional theme
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>{page_title}</title>
<!-- link rel="SHORTCUT ICON" href="{site_url}/favicon.ico" -->
<!--
<meta http-equiv="Pragma" content="no-cache">
-->
<link rel="stylesheet" type="text/css" href="{css_url}" title="{theme}">
</head>
<body onload="document.xfrm.uword.focus();">
{feed_url}
{plg_headercode}
{advanced_editor}
<script type="text/javascript">
function delconfirm()
{
Then goto your /layout/theme/custom directory where your memberdetail.thtml file is located and change it to whats list below. Notice the change for the body onload statement and placement of it.
Text Formatted Code
<!-- This is an example template file for the Custom User Registration Feature -->
<!-- To be located under theme/custom directory - Example XSilver/custom/memberdetail.thtml -->
<body onload="document.xfrm.uword.focus();">
{startblock}
{message}
<div align="center">
<form action="{post_url}" method="post" name="xfrm" onsubmit="return jcap();">
<table width=500 border=0 cellspacing=0 cellpadding=0>
<tr>
This change will work and got rid of the script error messages on the bottom of the IE web browser or other browsers that display such messages.