<form target="Name of go url" action="https://www.dtsclothing.com"
method="post">
<input type="image"
src="https://www.dtsclothing.com/index_files/image1118.jpg" border="0"
name="submit" alt="This is where it says Next!">
</form>

Where it says http://dtsclothing.com
change it to where you want it to go

src="  is where the button pic comes from

I have this set up to pull my paypal pic
and to call up my site [wich needs a little help-take a look at the
floating html post a couple of spots down] and it loads in a new window..
hope it helps, good luck.

In addition to the method described by dtschothing,
Reference:
http://office.microsoft.com/en-us/publisher/HA011587451033.aspx
describes two methods.

If you choose to use the ECMAScript code approach, note that the first
javascript code snippet in Step 2 is incorrect on the website. Instead of:

<script language="JavaScript" type="text/javascript"> <!-- function
Show(Url, Name, Features) { window.open(Url, Name, Features); } // -->
</script>

Use this instead:

<script language="JavaScript" type="text/javascript">function Show(Url,
Name, Features) { window.open(Url, Name, Features); }</script>

I find I make less errors writing the code snippet links (step 4) by
creating a separate text box (Courier font) that I drag off into the scratch
area just for purpose of writing the links, and just Ctrl + V to paste the
link in the hyperlink address field.  Easy and less errors for me...and once
you get one link to work correctly, you know you now have a working
"template" of the code snippet in that scratch area text box.

DavidF