var size = get_cookie("fontsize")==null ? 12 : get_cookie("fontsize");
var lineheight = get_cookie("lineheight")==null ? 17 : get_cookie("lineheight");

window.onload = function()
{
	document.body.style.fontSize = size+"px";
	document.body.style.lineHeight = lineheight+"px";
} 

function scaleFont(nr)
{
	/* Font size */
	size = Number(size);
	
	if(size+nr<17 && size+nr>10)
		size += nr;
	
	document.body.style.fontSize = size+"px";
	set_cookie("fontsize", size, 10);
	
	/* Line height */
	lineheight = Number(lineheight);
	
	if(lineheight+nr>17 && lineheight+nr<22)
		lineheight += nr;
	
	document.body.style.lineHeight = lineheight+"px";
	set_cookie("lineheight", lineheight, 10);
}

function set_cookie(name, value, days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
    
	document.cookie = name+"="+value+expires+"; path=/";
}

function get_cookie(name)
{
	var name_eq = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(name_eq) == 0) return c.substring(name_eq.length,c.length);
	}
	return null;
}