// font resize
function fontResize(font_size)
{
	var font_size = font_size.toInt();
	var content_node = $('main');
	
	// set new font-size
	content_node.setStyle('font-size', font_size+'px');
	
	// set cookie
	setCookie('fontSize', font_size, 365);
	
	initScrollbar();
}

// initialize scrollbar
function initScrollbar()
{
	var scrollable_node = $('text');
	var scrollable_node_coordinates = scrollable_node.getCoordinates();
	var scrollable_node_height = scrollable_node_coordinates.height;
	
	var scrollable_inner_node = scrollable_node.getElement('div');
	var scrollable_inner_coordinates = scrollable_inner_node.getCoordinates();
	var scrollable_inner_height = scrollable_inner_coordinates.height;
	
	if (scrollable_inner_height > scrollable_node_height)
	{
		$('scrollbar_y').setStyle('display', 'block');
		$('scrollbar_handler_y').setStyle('display', 'block');
		
		makeScrollbar(scrollable_node, $('scrollbar_y'), $('scrollbar_handler_y'));
	}
	else
	{
		scrollable_inner_node.setStyle('top', '0px');
		$('scrollbar_y').setStyle('display', 'none');
		$('scrollbar_handler_y').setStyle('display', 'none');
	}
}

// set cookie
function setCookie(c_name, value, expiredays)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+
	((expiredays==null) ? "" : ";expires="+exdate.toGMTString()+";path=/");
}

// get cookie
function getCookie(c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1; 
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	
	return "";
}

// check cookie
function checkCookie()
{
	var font_size = getCookie('fontSize');
	
	if (font_size != null && font_size != "")
	{
		fontResize(font_size);
	}
}