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()",5);