How to use frameset

I want to use frameset in my template.
I have top and nested left frames

<frameset rows="80,*" cols="*" frameborder="no" border="0" framespacing="0">
<frame src="header.htm" name="topFrame" scrolling="No" noresize="noresize" id="topFrame" />
<frameset cols="80,*" frameborder="no" border="0" framespacing="0">
<frame src="menu_left.htm" name="leftFrame" scrolling="No" noresize="noresize" id="leftFrame" />
<frame src="content.htm" name="mainFrame" id="mainFrame" />
</frameset>
</frameset>

How to use frameset n frame in fast template class?
can somebody help me....... please

Where is here the Fast Template problem??