// Javascript originally by Paul Snowden and Peter-Paul Koch.

// See http://alistapart.com/articles/alternate/.

// Modifications by mbl.is to support two sets of alternate stylesheets



function createCookie(name,value,days,path) {

  if (!path) { path = "/"; }

  var expires = "";

  if (days) {

    var date = new Date();

    date.setTime(date.getTime()+(days*24*60*60*1000));

    expires = "; expires="+date.toGMTString();

  }

  document.cookie = name+"="+value+expires+"; domain=.sja.is; path="+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 setActiveStyleSheet(title,type) {

  var i, a, main;

  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {

    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && isStyleSheetType(a.getAttribute("title"),type)) {

      a.disabled = true;

      if(a.getAttribute("title") == title) a.disabled = false;

    }

  }

  setStyleSheetImages(title,type);

}



function setStyleSheetImages (title,type) {

  if (type == "width") { setStyleSheetWidthImages(title) }

  else                 { setStyleSheetFontImages(title) }

}



function setStyleSheetFontImages (title) {

  if (!(document.createElement && document.getElementsByTagName)) {

	return;

  }

  var elem = document.getElementById("leturblokk");

  if (!elem) { return; }

  var imgs = elem.getElementsByTagName('img');

  if (!imgs[0]) { return; }

  var names = new Array('', 'Stærra letur', 'Breyta litum á bakgrunn og texta', 'Larger font', 'Change background and text colours');

  var i, set;

  set = 0;

}



function setStyleSheetWidthImages (title) {

  if (!(document.createElement && document.getElementsByTagName)) {

	return;

  }

  var elem = document.getElementById("breiddarblokk");

  if (!elem) { return; }

  var imgs = elem.getElementsByTagName('img');

  if (!imgs[0]) { return; }

  var names = new Array('Minni skjábreidd (800 dílar)', '', 'Meiri skjábreidd (1280 dílar)', 'Small screen (800 pixels)', 'Larger screen (1280 pixels)');

}



function mozRepaintFix () { // Fixes Gecko problem with position of top ad

  if (navigator.userAgent.search(/Gecko/) != -1) { window.resizeBy(-1,-1) && window.resizeBy(1,1); }

}



function isStyleSheetType(str,type) {

  if      (str == "")                             { return true; }

  else if (type == "width" && str.match(/\d/))    { return true; }

  else if (type != "width" && str.match(/^\D*$/)) { return true; }

  return false;

}



function getActiveStyleSheet(type) {

  var i, a;

  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {

    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && isStyleSheetType(a.getAttribute("title"),type) && !a.disabled) return a.getAttribute("title");

  }

  return null;

}



function getPreferredStyleSheet() {

  var i, a;

  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {

    if(a.getAttribute("rel").indexOf("style") != -1

       && a.getAttribute("rel").indexOf("alt") == -1

       && a.getAttribute("title")

       ) return a.getAttribute("title");

  }

  return null;

}



// This function is redefined in ie5win-fix.js for IE 5.x on Windows.

// As defined below it has no effect except in Mac IE 5.x.

function ie5widthfix (title) {

  if (navigator.appVersion.indexOf('Mac') != -1 && document.all) {

    var ih = new getObj("innihald");

	if (ih && ih.style) {

      if (title.match(/800/)) {

        ih.style.width = "501px";

      } else if (title.match(/1280/)) {

        ih.style.width = "801px";

      } else {

        ih.style.width = "551px";

      }

    }

  }

  return true; 

}



window.onload = function(e) {

  var cookie = readCookie("sja_style");

  var title = cookie ? cookie : getPreferredStyleSheet();

  setActiveStyleSheet(title,"fontsize");

  cookie = readCookie("sja_wstyle");

  title = cookie ? cookie : getPreferredStyleSheet();

  setActiveStyleSheet(title,"width");

  ie5widthfix(title);

}



window.onunload = function(e) {

  var title = getActiveStyleSheet("fontsize");

  createCookie("sja_style", title, 365);

  title = getActiveStyleSheet("width");

  createCookie("sja_wstyle", title, 365);

}



var cookie = readCookie("sja_style");

var title = cookie ? cookie : getPreferredStyleSheet();

setActiveStyleSheet(title,"fontsize");

cookie = readCookie("sja_wstyle");

title = cookie ? cookie : getPreferredStyleSheet();

setActiveStyleSheet(title,"width");

ie5widthfix(title);