var scroll_height = 300;
var max_height = 650;

function $(obj){ //get element by id
	return document.getElementById(obj);
}
function add_scrollbar(){
	container = $("headline_content");
	cont_height = container.offsetHeight;
	main_height = $('left').offsetHeight - 49 - $('partners').offsetHeight;
	var ban_height = $("main").offsetHeight - 49 - $('partners').offsetHeight;
	main_height = ban_height > main_height ? ban_height : main_height;
	if(main_height > scroll_height) scroll_height = main_height;
	if(scroll_height > max_height) scroll_height = max_height;
	if(cont_height > scroll_height){
		container.innerHTML = 
		'<div id="bg" onSelectStart="return false;" onMouseDown="return false;">' +
		'<div id="s-bg"></div>' +
		'<div id="s-instant" onMouseDown="slide();"></div>' +
		'<div id="s" onMouseDown="mDown(this)" onMouseOver="mOver(this)" onMouseOut="mOut(this)"></div>' +
		'</div>' +
		'<div id="scrolling">' +
		container.innerHTML +
		'</div>';
		cont_height = $("scrolling").offsetHeight;
		$('scrolling').style.height = $('s-instant').style.height = container.style.height = $('bg').style.height = $('s-bg').style.height = scroll_height + "px";
		var s_height = 2 * scroll_height - cont_height;
		$('s').style.height = (s_height > 100 ? s_height : 100) + "px";
		document.body.onmouseup = function(){slideStop();}
	}
}
function scroll(Y, full){
	$('scrolling').scrollTop = (cont_height - scroll_height) / full * Y;
}