I have a problem. Basically, using the simple frame code on lissa explains

<frameset cols=40%60%>
<frame src="left.html" name="leftside" scrolling=no>
<frame src="right.html" name="rightside" scrolling=no>
</frameset>

I am getting a grey line down the middle which allows people to change the width of the frames. How can I remove this?

Stupid question, don't worry. I didn't realise thats what people meant when they taked about borders.