// text size


var font_sizes = new Array(.75, .9, 1, 1.1);
var current_font_level = 0;
var decrease_font_level = 0;
var increase_font_level = 0;

function setFontSizeLevels() {
    if (readCookie('font_size') == null) {
        increase_font_level = 1;
    }
    else {
        current_font_level = parseInt(readCookie('font_size'));
        increase_font_level = current_font_level + 1;
        decrease_font_level = current_font_level - 1;

        if (increase_font_level >= font_sizes.length)
            increase_font_level = font_sizes.length - 1;
        if (decrease_font_level < 0)
            decrease_font_level = 0;
    }
}

function loadFontSize() {
    if (readCookie('font_size') == null) {
        current_font_level = 0;
    } else {
        current_font_level = parseInt(readCookie('font_size'));
    }
    setFontSize(current_font_level);
}

function setFontSize(size) {
    if (size >= 0 && size < font_sizes.length) {
        current_font_level = size;
    }
    else if (++current_font_level >= font_sizes.length) {
        current_font_level = 0;
    }

    if (document.body) {
        document.body.style.fontSize = font_sizes[current_font_level] + 'em';
        createCookie("font_size", current_font_level, "30");
        setFontSizeLevels();
    }
}

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 var 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;
}

function eraseCookie(name) {
    createCookie(name, "", -1);
}

loadFontSize();