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

function readCookie(name)
{
	var nameEQ = 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(nameEQ) == 0)
			return c.substring(nameEQ.length,c.length);
	}
	return null;
}

window.onload = function()
{
	TransparantCookie = readCookie("Transparant");
	if (TransparantCookie == null)
	TransparantCookie = true;
	if (TransparantCookie == 'false')
	toggleStylesheet("Transparant");

	ExifCookie = readCookie("Exif");
	if (ExifCookie == null)
	ExifCookie = true;
	if (ExifCookie == 'false')
	toggleStylesheet("Exif");

	KleurCookie = readCookie("Kleur");
	if (KleurCookie == null)
	KleurCookie = 'KleurWhite';
	if (KleurCookie != null)
	toggleStylesheetPerm(KleurCookie);
}

function toggleStylesheetPerm(stylesheet)
{
	if (stylesheet == 'Transparant')
	{
		if (TransparantCookie == 'false')
		{
			TransparantCookie = true;
			createCookie('Transparant',TransparantCookie,365);
		}
		else
		{
			TransparantCookie = false;
			createCookie('Transparant',TransparantCookie,365);
		}
		toggleStylesheet('Transparant');
	}

	else if (stylesheet == 'Exif')
	{
		if (ExifCookie == 'false')
		{
			ExifCookie = true;
			createCookie('Exif',ExifCookie,365);
		}
		else
		{
			ExifCookie = false;
			createCookie('Exif',ExifCookie,365);
		}
		toggleStylesheet('Exif');
	}

	else
	{
		KleurCookie = stylesheet;
		createCookie('Kleur',KleurCookie,365);
		setActiveStylesheet(stylesheet);
	}
}

function toggleStylesheet(title)
{
	var i, a, main;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
	{
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && a.getAttribute("title") == title)
		{
			if (a.disabled)
				a.disabled = false;
			else
				a.disabled = true;
		}
	}
}


function setActiveStylesheet(title)
{
	var i, a, main;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
	{
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && a.getAttribute("title").indexOf("Kleur") != -1)
		{
			a.disabled = true;
			if(a.getAttribute("title") == title)
				a.disabled = false;
		}
	}
}