var speed=32;

function movedown(){
	crossobj=getsize();
	if (parseInt(crossobj.style.top)>=(crossobj.offsetHeight*(-1)+164))	crossobj.style.top=parseInt(crossobj.style.top)-speed+"px";
}

function moveup(){
	crossobj=getsize();
	if (parseInt(crossobj.style.top)<=-32) crossobj.style.top=parseInt(crossobj.style.top)+speed+"px";
}

function getsize(){
	return document.getElementById? document.getElementById("scroll") : document.all.content;
}