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

function initialize(){ 
if (window.parent.scrollspeed!=0){ 
speed=window.parent.scrollspeed 
scrollwindow() 
} 
} 

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

window.scrollBy(0,speed) 
} 

setInterval("initialize()",10)