Link to external file in CHM from Button1

Hi All,

I've done some searching and have the start of this. Per Subject, I would like to link to a provided index.htm file that is included in the release CHM directory.  I searched the forum and found the following:

describes the JS to get the relative URL

https://docs.microsoft.com/en-us/previous-versions/windows/desktop/htmlhelp/example--link-to-a-file-outside-of-your-help-system?redirectedfrom=MSDN

So here is what I tried.  I created a script in the RH2019.Patch9 project.

function

URL_Parser(fn) {
var X, Y, sl, a, ra, link;
ra = /:/;
a = location.href.search(ra);
if (a == 2)
X = 14;
else
X = 7;
sl = "\\";
Y = location.href.lastIndexOf(sl) + 1;
link = 'file:///' + location.href.substring(X, Y) + fn;
location.href = link;
}

Then I simply added a Button1 URL as follows:

<a onclick="URL_Parser('index.htm')" style="text-decoration: underline; color: green; cursor: hand">Link to QSG</a>

However, this does not work.

Searching a bit, someone recommended keeping the script right inside the HTM page. 

So I did a test link by adding the following to the bottom of my file:

<script language="JScript">
//<![CDATA[
function URL_Parser(fn) {
var X, Y, sl, a, ra, link;
ra = /:/;
a = location.href.search(ra);
if (a == 2)
X = 14;
else
X = 7;
sl = "\\";
Y = location.href.lastIndexOf(sl) + 1;
link = 'file:///' + location.href.substring(X, Y) + fn;
location.href = link;
}
//]]>
</script>
<p><a onclick="URL_Parser(&#39;index.htm&#39;)" style="text-decoration: underline;color:green;cursor: hand">Link to QSG</a></p>

And this worked per the figure. 

So what do I need to do to get this to kick off from the button?

thanks.