function changeFontSize(PlusMinus) {
	var active = getActiveStyleSheet();
 	if(PlusMinus == "+"){
		switch (active){
			case 'T-' : 
				setActiveStyleSheet('T', false);break;
			case 'T' : 
				setActiveStyleSheet('T+', false);break;
			case 'T+' : 
				setActiveStyleSheet('T+', false);break;
			default :
				setActiveStyleSheet('T', false);break;
		}
	}
	else if(PlusMinus == "-"){
		switch (active){
			case 'T-' : 
				setActiveStyleSheet('T-', false);break;
			case 'T' : 
				setActiveStyleSheet('T-', false);break;
			case 'T+' : 
				setActiveStyleSheet('T', false);break;
			default :
				setActiveStyleSheet('T', false);break;
		}
	}	
}

////////////////////////////////////////////////////////////////////////

function setActiveStyleSheet(title, reload){
	if(!document.getElementsByTagName)return
	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;
		}
	}
	if (reload == true){
		createFontCookie("NpsomFont", title, 365);
		document.location.href = document.location.href;
	}	
}

////////////////////////////////////////////////////////////////////////

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

////////////////////////////////////////////////////////////////////////

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

////////////////////////////////////////////////////////////////////////

function readFontCookie(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(e){
	var cookie = readFontCookie("NpsomFont");
	var title = cookie ? cookie : "T";
  	if (title == 'null')title = "T";
	setActiveStyleSheet(title,false);
}

window.onunload = function(e) {
	var title = getActiveStyleSheet();
	createFontCookie("NpsomFont", title, 365);
}

////////////////////////////////////////////////////////////////////////

var cookie = readFontCookie("NpsomFont");
var title = cookie ? cookie : "T";
if (title == 'null')title = "T";
setActiveStyleSheet(title, false);