function setFontsize(value) {
    var actual_size = getFontsize();
    
    if (value=="up") {
        value = "big";
        if (actual_size=="small") value = "middle";
    }
    if (value=="down") {
        value = "small";
        if (actual_size=="big") value = "middle";
    }
    
    var date = new Date();
    date.setTime(date.getTime()+(100*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
    
    document.cookie = 'fontsize'+"="+value+expires+"; path=/";
    
    var size = '100%';
    if (value=='middle') size = '120%';
    if (value=='big') size = '140%';
    
    jQuery('#left').css('font-size', size);
}

function getFontsize() {
    var nameEQ = "fontsize=";
    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 initFontsize() {
    var size = getFontsize();
    setFontsize(size);
}

jQuery(document).ready(function() {
    initFontsize();
    
    jQuery('#fontsize_up').click(function() {
        setFontsize('up');
        return false;
    });
    jQuery('#fontsize_down').click(function() {
        setFontsize('down');
        return false;
    });
});