Javascript Scroll

Hi, I'm working on a javascript. There are two links that call the functions, which in turn moves an iframe left or right. My only question is, how do I make it work in Internet Explorer? THANKS!

<script language="javascript" type="text/javascript">
function goLeft() {
intx = portfolio.pageXOffset;
while (portfolio.pageXOffset>intx-150&portfolio.pageXOffset>0) {
portfolio.scroll(portfolio.pageXOffset-1,0)
}
}
function goRight() {
intx = portfolio.pageXOffset;
while (portfolio.pageXOffset<intx+150&portfolio.pageXOffset<1350) {
portfolio.scroll(portfolio.pageXOffset+1,0)
}
}
</script>

Does it work in any other browser?

yes, instead of using pageXoffset like crazy (it doesn't work with MSIE) here's what i did:

if (navigator.appName == "Microsoft Internet Explorer") {
x = portfolio.document.body.scrollLeft;
} else {
x = portfolio.pageXOffset;
}