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<Marquee direction="up" height=100% id=scroller onmouseout=this.start(); onmouseover=this.stop(); scrollAmount=1 scrollDelay=50 width=100%>
<IFRAME border=0 name=news src="news.asp" frameBorder=0 width=100% scrolling=no height=100% content=150></IFRAME>
</MARQUEE>
Some other browsers are now supporting simple text scrolling with the <marquee> tag - but there's nowhere except IE that you can use marquee to scroll an iframe document. I never knew it could be done until you posted about it!
Eyetracker research has shown that people do not handle moving text on screen at all well. They just look elsewhere. And then, when people do try to read elsewhere on the page, the motion of the text scroller is a distraction that slows down reading speed.
However, if you want to use <marquee> then enclose plain text in there (not an iframe element) and style the marquee with css Microsoft Reference [msdn.microsoft.com].
Firefox and Opera will give that kind of implementation some support, although not the entire pile of modifications that MS has online - but I'm not sure about Safari and other Macintosh browsers.