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 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 eraseCookie(name) {
	createCookie(name,"",-1);
}
function setLang(lng) {
 var x = readCookie('txLangSet');
 if ((x=="")||(x==null)) {
  // OK;
 } else {
  eraseCookie('txLangSet');
 }
 var date = new Date();
 date.setTime(date.getTime()+(90*24*60*60*1000)); // 90 dagen
 var expires = "; expires="+date.toGMTString();
 // expires=""; // test: end of session
 document.cookie = "txLangSet"+"="+lng+expires+"; path=/";
}
function chkLang() {
 var docref='na';
 if (document.referrer) {
  docref=escape(document.referrer);
  if (docref.indexOf('language') > 0) {
   setLang('1');
  }
 }
}
function evalLang(dir, abbr) {
 var x = readCookie('txLangSet');
 if ((x=="")||(x==null)) {
  location.href="language" + abbr + ".html";
 }
 else {
  location.href="/" + x + "/" + dir + "/" + "index.html";
 }
}