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 saveComputed() {
    $(font_elements_to_resize).each(function(index) {
        var t = $(this);
        var fs = t.css('font-size');
        if (fs) {
            var px_val = getFontPx(fs);
            if (px_val > 0) { t.attr('fs', px_val); }
        }
    });
}
function getFontPx(val) {
    if (val) {
        var px_index = val.indexOf('px');
        if (px_index > 0) { val = val.replace('px', ''); }
        var px_val = parseInt(val);
        if (!isNaN(px_val)) { return px_val; }
    }
    return 0;
}
function setFont() {
    $(font_elements_to_resize).each(function(index) {
        var t = $(this);
        var fs = t.attr('fs');
        if (fs) {
            t.css('font-size', (parseInt(fs) + font_relative_size) + 'px');
        }
    });
    createCookie('fontsize', font_relative_size, 1);
}


var font_elements_to_resize = "#main *";
var font_relative_size = 0;
$(document).ready(function() {
    saveComputed();
    $("#fontgrow").click(function() { font_relative_size += 2; setFont(); return false; });
    $("#fontshrink").click(function() { font_relative_size -= 2; setFont(); return false; });
    $("#fontreset").click(function() { font_relative_size = 0; setFont(); return false; });

    var cookie = readCookie('fontsize');
    if (cookie) { font_relative_size = parseInt(cookie); setFont(); }
});