function setActiveStyleSheet(title) {
    var i, a, main;
    var found = false;
    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;
                found = true;
                break;
            }
        }
    }
    return found;
}

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 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;
}

/*
function scanStyleSheet() {
    var i, a;
    var found = false;
    for(i = 0; a = document.getElementsByTagName("link")[i]; i++) {
        if (a.disabled) {
            found = true;
            break;
        }
    }
    if (!found) {
        setActiveStyleSheet('Standard');
    }
    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 {
        expires = "";
    }
    document.cookie = name + "=" + value + expires + "; 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;
}


var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (!setActiveStyleSheet(title)) {
    setActiveStyleSheet("Standard")
}