function setCookie(cookieName,cookieValue,nDays) {
    var today = new Date();
    var expire = new Date();
    if (nDays==null || nDays==0) nDays=1;
    expire.setTime(today.getTime() + 3600000*24*nDays);
    document.cookie = cookieName+"="+escape(cookieValue) + ";expires="+expire.toGMTString();
  }


  function scaleText(percentage, set_cookie){
    /* scale text only if percentage is not equal to default font size */
    defaultfontsize = "80"; /* set to font-size on body element */
    bodyelem = document.getElementsByTagName("body")[0];
    if (percentage != defaultfontsize){
      bodyelem.style.fontSize = percentage + "%";
    }

  if ((percentage == defaultfontsize)&&(set_cookie)){
      bodyelem.style.fontSize = percentage + "%";
    }
    if (set_cookie){
      setCookie("basefontsize", percentage, 365);
    }
  }
  
    function inspectFontSizeCookie(){
    value = readCookie("basefontsize");
    if (value){
      scaleText(value, set_cookie=false);
    }
  }
    

  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)
  {
    setCookie(name,"",-1);
  }     
 



  function setContrastColor(variant){
    // variant == 1 -> yellow on black
    // variant == 2 -> black on yellow
    if (variant == 1){
      eraseCookie("cpc_blackyellow");
      setCookie("cpc_yellowblack", "true", 1);
      setCookie("cpc_nc", "true", 1);
    }
    else if (variant == 2){
      eraseCookie("cpc_yellowblack");
      setCookie("cpc_blackyellow", "true", 1);      
      setCookie("cpc_nc", "true", 1);
    } else {
      alert("Ugyldig variant, bruk 1 eller 2.")
    }
    window.location.reload();
  }

  function setNormalColor(){
    eraseCookie("cpc_yellowblack");
    eraseCookie("cpc_blackyellow");
    eraseCookie("cpc_nc");
    window.location.reload();
  }



  function inspectCookies(){
    inspectFontSizeCookie();
  }