var fontSize = 12;
// Funktion erhöht/erniedrigt die Schriftgröße
// und ruft dann die Funktion zum setzen der entsprechenden Stylesheet auf
function changeActiveStyleSheet(action)
{
	if(action == 'plus' && fontSize < 18)
		fontSize++;
	else if(action == 'minus' && fontSize > 12)
		fontSize--;
	setActiveStyleSheet(fontSize);
}

function setActiveStyleSheet(size) 
{
	title = 'fonts_' + size + 'px';		// CSS Dateinamen erstellen
   	var i, a, main;
   	for(i = 0; (a = document.getElementsByTagName("link")[i]); i++) 
   	{
     	if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) 
	 	{
       		a.disabled = true;
       		if(a.getAttribute("title") == title) 
				a.disabled = false;
     	}
   	}
	createCookie("cookieFontStyle", size, 7);
}
function getStyleCookie()
{
	var fontStyle = readCookie('cookieFontStyle');
	if(fontStyle)
	{
		setActiveStyleSheet(fontStyle);
		fontSize = fontStyle;		// Wert aus Cookie in globale Var. speichern
	}
	else
		setActiveStyleSheet(12);
}
// Cookie-Funktionen
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 
		var 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;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}