var t = 0;
function scrollUp() {
	t += 20;
	with(document.getElementById("box5")) {
		if (t > 0)
			t = 0;	
		if(style)
			style.top = t + "px";
		else
			setAttribute("style", "top: " + t + "px");
	}
    scrolldelay = setTimeout('scrollUp()',100);
}
function scrollDown() {
	t -= 20;
	with(document.getElementById("box5")) {
	if(t < -clientHeight)
		t = -clientHeight;
	if(style)
		style.top = t + "px";
	else
		setAttribute("style", "top: " + t + "px");
	}
    scrolldelay = setTimeout('scrollDown()',100);
}
function scrollStop() {
   	clearTimeout(scrolldelay);
}