HTML/CSS/Frame Attributes/framespacing
"framespacing" creates additional space in pixels between the frames
<HTML>
<head><Title>Example For framespacing</Title></head>
<frameset rows="*"
cols="125,*"
frameborder="yes"
border="20px"
framespacing="5">
<frame name="leftFrame"
scrolling="NO"
noresize
src="http://www.wbex.ru">
<frameset rows="200,*"
border="15px"
framespacing="0">
<frame name="topFrame"
noresize
scrolling="NO"
src="http://www.wbex.ru">
<frame name="mainFrame" src="http://www.wbex.ru">
</frameset>
</frameset>
</HTML>