var speed, currentpos=curpos1=0,alt=1,curpos2=-1

function subnav(){
if (window.parent.subscrollspeeder!=0){
speed=window.parent.subscrollspeeder
scrollsubwindow()
}
}

function scrollsubwindow(){
temp=(document)? document.body.scrollTop : window.pageYOffset
alt=(alt==0)? 1 : 0
if (alt==0)
curpos1=temp
else
curpos2=temp

window.scrollBy(0,speed)
}

//setInterval("subnav()",10)