To create a seamless join between frames in both Netscape and Microsoft browsers, you must set the FRAMESPACING, FRAMEBORDER and BORDER attributes all to zero, as in the example below.
<FRAMESET COLS="120,*" FRAMEBORDER=0 BORDER=0 FRAMESPACING=0>
<FRAME SRC="toolbar.htm" MARGINWIDTH=2>
<FRAME SRC="../frames/fintro.htm">
</FRAMESET>