var amount = 5;
var min_size = 11;
var max_size = 41;
var cookie_name = "access_size";

$(document).ready(function(){
   if($.cookie(cookie_name) != null)
   {
	   $("body").css("font-size", $.cookie(cookie_name)+"px");
   }
});

function increase()
{
	var font_size_text = $("body").css("font-size");
	var font_size = parseInt(font_size_text.substring(0, 2));
	if (font_size < max_size)
	{
		var new_font_size = font_size + amount;
		$("body").css("font-size", new_font_size+"px");
		$.cookie(cookie_name, new_font_size, {path : "/"});
	}
}

function decrease()
{
	var font_size_text = $("body").css("font-size");
	var font_size = parseInt(font_size_text.substring(0, 2));
	if (font_size > min_size)
	{
		var new_font_size = font_size - amount;
		$("body").css("font-size", new_font_size+"px");
		$.cookie(cookie_name, new_font_size, {path : "/"});
	}
}