Here's the frames with some syntax I've tried regarding the Doctype - thanks
<%@ Page Language="C#" Inherits="project1.WebForm1"
CodeFile="Frames.aspx.cs" %>
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-Frameset.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
<!--DOCTYPE transitional PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"-->
<!--!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"
http://www.w3.org/TR/html4/frameset.dtd">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"-->
<head>
<title>Project1</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1" />
<meta name="CODE_LANGUAGE" content="C#" />
<meta name="vs_defaultClientScript" content="JavaScript" />
<meta name="vs_targetSchema"
content="
http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd" />
<meta http-equiv="Expires" content="0" />
<meta http-equiv="Cache-Control" content="no-cache" />
<meta http-equiv="Pragma" content="no-cache" />
<!--meta name="vs_targetSchema"
content="
http://schemas.microsoft.com/intellisense/ie5"-->
</head>
<body>
<frameset framespacing="no" rows="54px,600" id="tabstrip" border="no"
frameborder="no">
<frame name="tab" src="tabstrip/default.aspx"/ frameborder="no"
scrolling="no">
<frameset framespacing="no" cols="15%,85%" id="toolbar" border="no"
frameborder="no">
<frame name="nav" src="toolbar/sometoolbar.html" scrolling="no">
<%--frame name="main"
src="
http://www.someredirect.com/nav/treeview1.aspx" scrolling=yes
noresize--%>
<frame name="main" src="/somepage/info.aspx" scrolling="yes">
</frameset>
</frameset>
</body>
</html>
