var scrollspeed_body=0;
	var scrollspeed_menu=0;      

	function move_up_down_content() 
	{
		document.getElementById('scroll_body').scrollTop = document.getElementById('scroll_body').scrollTop+scrollspeed_body;
	}

	function move_up_down_menu() 
	{
		document.getElementById('scroll_menu').scrollTop = document.getElementById('scroll_menu').scrollTop+scrollspeed_menu;
	}
  
	function checkArrows() 
	{
		var menuheight =   document.getElementById('menuheight').offsetHeight;
		var contentheight = document.getElementById('contentheight').offsetHeight;
		if ( menuheight >= 280 )
		{
			document.getElementById('menu_arrow_up').className = 'showarrow';
			document.getElementById('menu_arrow_down').className = 'showarrow';
		}
		if ( contentheight >= 410 )
		{
			document.getElementById('content_arrow_up').className = 'showarrow';
			document.getElementById('content_arrow_down').className = 'showarrow'; 
		}   
	}