Javascript help.

Hi guys, I am using this java script to make a page move across the browser, (in a frame set) i was wondering if this script could be changed so that when you mouse over the scrolling page it stops.

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<script language="JavaScript1.2">
<!--

var currentpos=0,alt=1,curpos1=0,curpos2=-1
function initialize(){
startit()
}
function scrollwindow(){
if (document.all)
temp=document.body.scrollLeft
else
temp=window.pageXOffset
if (alt==0)
alt=1
else
alt=0
if (alt==0)
curpos1=temp
else
curpos2=temp
if (curpos1!=curpos2){
if (document.all)
currentpos=document.body.scrollLeft+2
else
currentpos=window.pageXOffset+2
window.scroll(currentpos,0)
}
else{
currentpos=0
window.scroll(currentpos,0)
}
}
function startit(){
setInterval("scrollwindow()",80)
}
window.onload=initialize

function MM_displayStatusMsg(msgStr) { //v2.0
status=msgStr;
document.MM_returnValue = true;
}
//-->
</script>
--------------

Can anyone help?