function setActiveStyleSheet(strTitle) {
    var arrayTags = document.getElementsByTagName("link");
    var i, objTag;
    for (var i=0; i < arrayTags.length; i++) {
        objTag = arrayTags[i];
        if (objTag.getAttribute("rel").indexOf("style") != -1 && objTag.getAttribute("title")) {
            objTag.disabled = true;
            if (objTag.getAttribute("title") == strTitle) {
                objTag.disabled = false;
            }
        }
    }
    
    var strDomain;
    if (endsWith(window.location.hostname.toLowerCase(), "thunderbird.edu")) {
        strDomain = "thunderbird.edu";
    } else {
        strDomain = null;
    }

    writeCookie(COOKIE_NAME_ACTIVE_STYLESHEET, strTitle, 90, '/', strDomain, false);
}

function endsWith(strSource, strEnd) {
    if (strEnd.length > strSource.length) {
        return false;
    }
    return strSource.indexOf(strEnd) == (strSource.length - strEnd.length);
}

function getActiveStyleSheet() {
    var arrayTags = document.getElementsByTagName("link");
    var objTag;
    for (var i=0; i < arrayTags.length; i++) {
        objTag = arrayTags[i];
        if (objTag.getAttribute("rel").indexOf("style") != -1 && objTag.getAttribute("title") && !objTag.disabled) {
            return objTag.getAttribute("title");
        }
    }
    return null;
}

function setTextSize() {
    var strTitle = readCookie(COOKIE_NAME_ACTIVE_STYLESHEET);
    if (strTitle == null) {
        strTitle = DEFAULT_STYLESHEET_TITLE;
    }
    setActiveStyleSheet(strTitle);
}

var COOKIE_NAME_ACTIVE_STYLESHEET = "style";
var DEFAULT_STYLESHEET_TITLE = "medium";

//Uncomment following line if stylesheets are linked after this javascript file in the html
//addOnloadEvent(setTextSize);

setTextSize();