function setstyle(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") == "stylesheet" && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

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

function setcookie(value) {
  document.cookie = "style="+value+"; path=/";
}

function getcookie() {
  var nameEQ = "style=";
  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 = readCookie("style");
  var title = cookie ? cookie : "red";
  setstyle(title);
}

window.onunload = function(e) {
  var title = getstyle();
  setcookie(title);
}

var cookie = getcookie("style");
var title = cookie ? cookie : "red";
setstyle(title);