var prefsLoaded = false;
var defaultFontSize = 100;
var currentFontSize = defaultFontSize;

function revertStyles() {

    currentFontSize = defaultFontSize;
    changeFontSize(0);

}

function toggleColors() {
    if (currentStyle == "White") {
        setColor("Black");
    } else {
        setColor("White");
    }
}

function changeFontSize(sizeDifference) {
    currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);

    if (currentFontSize > 145) {
        currentFontSize = 145;
    } else if (currentFontSize < 60) {
        currentFontSize = 60;
    }

    setFontSize(currentFontSize);
};

function setFontSize(fontSize) {
    var stObj = (document.getElementById) ? document.getElementById('content_area') : document.all('content_area');
    document.body.style.fontSize = fontSize + '%';

    //alert (document.body.style.fontSize);
};


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;
};

window.onload = setUserOptions;

function setUserOptions() {
    if (!prefsLoaded) {

        cookie = readCookie("fontSize");
        currentFontSize = cookie ? cookie : defaultFontSize;
        setFontSize(currentFontSize);

        prefsLoaded = true;
    }

}

window.onunload = saveSettings;

function saveSettings() {
    createCookie("fontSize", currentFontSize, 365);
}