HTML Attribute for <FRAMESET ...>
BORDERCOLOR =color expression

BORDERCOLOR sets the color of the borders in the frameset.

This Code Makes This 
<FRAMESET ROWS="50%,*" BORDERCOLOR=RED>
 <FRAME SRC="fsbctitle.html">
 <FRAME SRC="fsbcmain.html">
<NOFRAMES>NOFRAMES stuff
</NOFRAMES>
</FRAMESET>
this page

there is no defined behaviour if you use BORDERCOLOR in both <FRAMESET ...> and <FRAME ...>. Different versions of MSIE resolve the situation differently. Netscape is a more consistent. In Netscape, <FRAMESET BORDERCOLOR="..."> sets the color for all borders, and <FRAME BORDERCOLOR="..."> makes exceptions to that rule. For example, this code sets the borders for all frames to yellow for the borders of the middle frame which are red:

This Code Makes This 
<FRAMESET ROWS="*,*,50%,*,*" BORDERCOLOR=YELLOW>
 <FRAME SRC="fsbcex1.html">
 <FRAME SRC="fsbcex2.html">
 <FRAME SRC="fsbcexmain.html" BORDERCOLOR=RED>
 <FRAME SRC="fsbcex3.html">
 <FRAME SRC="fsbcex4.html">
<NOFRAMES>NOFRAMES stuff
</NOFRAMES>
</FRAMESET>
this page

<FRAME ...> >