var objContent, objScroll;
var speed = 2;
var agt=navigator.userAgent.toLowerCase();
var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
   
if(is_win && document.all){
	speed=3;
}
var delay = 1;
var maxBottom = 0;
var maxTop;
var scrollTimeout;

function scrollObj(dir){

	objContent.top += dir*speed;
	if(objContent.top>maxTop && objContent.top<maxBottom){
		objContent.style.top = objContent.top;
		eval("scrollTimeout = window.setTimeout('scrollObj("+dir+")',delay);");
	}
	else{
		if(dir>0){
			objContent.top = maxBottom;
		}
		else{
			objContent.top = maxTop;
		}
		objContent.style.top = objContent.top;
		stopObj();
	}
}
function stopObj(){
	window.clearTimeout(scrollTimeout);
}

function init(){
	if(typeof clipHeight != "undefined"){
		objContainer = document.getElementById('container');
		objContent = document.getElementById('content');
		objContent.top = 0;
		objScroll = document.getElementById('scroll');
		var maxHeight = document.getElementById('container').style.height;
		maxHeight = Number(maxHeight.substr(0,maxHeight.length-2));
	
		maxHeight = clipHeight;
	
		var textHeight = Number(document.getElementById('content').offsetHeight);
		if(textHeight>maxHeight){
			// show scroll-buttons
			objScroll.style.top=scrollY;
			objScroll.style.visibility="visible";
			maxTop = -(textHeight-maxHeight);
		}
	}
	bust();
}