saving frames

Hello, I work with dreamweaver4 at home and at work. At work I have a
problem with saving framesets and viewing in browswer . The problem occurs
not at home.

<frameset cols="19%,*" frameborder="NO" border="0" rows="*">
<frame src="menu.htm" scrolling="NO" marginwidth="0" marginheight="4"
name="menu" frameborder="NO">
<frameset rows="21%,*" frameborder="NO" border="0" framespacing="0"
cols="*">
<frame src="logo.htm" scrolling="NO" marginwidth="0" marginheight="0"
name="logo" frameborder="NO">
<frame src=opening.htm name="opening">
</frameset>
</frameset>

above is the code at home, but at work dreamweaver gives / (this) extra, so
that I cannot see the frameset in the browser:

<frameset cols="19%,*" frameborder="NO" border="0" rows="*">
<frame src="/menu.htm" scrolling="NO" marginwidth="0" marginheight="4"
name="menu" frameborder="NO">
<frameset rows="21%,*" frameborder="NO" border="0" framespacing="0"
cols="*">
<frame src="/logo.htm" scrolling="NO" marginwidth="0" marginheight="0"
name="logo" frameborder="NO">
<frame src="/opening.htm" name="opening">
</frameset>
</frameset>

Does anyone recognize this problem?

Thanks!!!