function scroll_init() {
	scroll_speed = 5;	
	scroll_obj = document.getElementById("scrollObj");
	scroll_obj_height = scroll_obj.offsetHeight;
	scroll_container = document.getElementById("scrollContainer");	
	scroll_container_height = parseInt(scroll_container.style.height);
	scroll_moveupvar = false;
	scroll_movedownvar = false;
	
	// set buttons invisible?
	if (scroll_obj_height > scroll_container_height) {
		document.getElementById("scrollButtonUp").style.visibility = "visible";
		document.getElementById("scrollButtonDown").style.visibility = "visible";
		document.getElementById("contentline").style.visibility = "visible";
	}
}
function scroll_moveup() {
	if (parseInt(scroll_obj.style.top) <= 0) {
		scroll_obj.style.top = parseInt(scroll_obj.style.top) + scroll_speed + "px";
	}
	scroll_moveupvar = setTimeout("scroll_moveup()",20);
}
function scroll_movedown() {	
	if (parseInt(scroll_obj.style.top) >= (scroll_obj_height * (-1) + scroll_container_height)) {
		scroll_obj.style.top = parseInt(scroll_obj.style.top) - scroll_speed + "px";
	}
	scroll_movedownvar = setTimeout("scroll_movedown()",20);
}