HTML frames - very basic question

[Loooren]

Hi -

Um, I'm trying to put a page together with thin frames running horizontally top and bottom, and the central section split into three columns. I can't quite see what's wrong with the following:

<frameset rows="20, *, 20">

<frameset cols="*">

<frame src="top.html" name="top" noresize scrolling="no" frameborder="0" marginwidth="0" marginheight="0">

</frameset>

<frameset cols="310, *, 30">

<frame src="left.html" name="left" noresize scrolling="no" frameborder="0" marginwidth="0" marginheight="0">

<frame src="news.html" name="news" noresize scrolling="no" frameborder="0" marginwidth="0" marginheight="0">

<frame src="right.html" name="right" noresize scrolling="no" frameborder="0" marginwidth="0" marginheight="0">

</frameset>

<frameset cols="*">

<frame src="bottom.html" name="bottom" noresize scrolling="no" frameborder="0" marginwidth="0" marginheight="0">

</frameset>

In Firefox white lines separate the frames despite frameborder="0", and in IE only the top frame shows at all. I'm sure there's a very obvious answer to all this... help, anyone?

Thanks in advance!