function fontsizeup(event)
{
	// Skip tabs; 9 being the ASCII code for a tab
	if (event && getKeyCode(event) == 9)
	{
		return true;
	}
    var active = getActiveStyleSheet();

    switch (active)
    {
        case 'A--':
            setActiveStyleSheet('A-');
        break;

        case 'A-':
            setActiveStyleSheet('A');
        break;

        case 'A':
            setActiveStyleSheet('A+');
        break;

        case 'A+':
            setActiveStyleSheet('A++');
        break;

        case 'A++':
            setActiveStyleSheet('A');
        break;

        default:
           		setActiveStyleSheet('A');
		break;
	}

	return false;
}

function fontsizedown(event)
{
	// Skip tabs
	if (event && getKeyCode(event) == 9)
	{
		return true;
	}

	var active = getActiveStyleSheet();


    switch (active)
    {
        case 'A++' : 
            setActiveStyleSheet('A+');
        break;

        case 'A+' : 
            setActiveStyleSheet('A');
        break;

        case 'A' : 
            setActiveStyleSheet('A-');
        break;

        case 'A-' : 
            setActiveStyleSheet('A--');
        break;

        case 'A--' : 
        break;

        default :
            setActiveStyleSheet('A--');
        break;
    }
return false;
}

function getKeyCode(event)
{
	// IE doesn't fire the onkeypress event for tabs
	// Reference: http://www.quirksmode.org/js/keys.html

	var code = (event.keyCode) ? event.keyCode : 0;

	// Probably using FF
	if (!code && event.charCode)
	{
		code = event.charCode;
	}

	return code;	
}

function setActiveStyleSheet(title)
{
    var i, a, main;

    for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
    {
        if (a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title'))
        {
            a.disabled = true;
            if (a.getAttribute('title') == title)
            {
                a.disabled = false;
            }
        }
    }
}

function getActiveStyleSheet()
{
    var i, a;

    for (i = 0; (a = document.getElementsByTagName('link')[i]); i++)
    {
        if (a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title') && !a.disabled)
        {
            return a.getAttribute('title');
        }
    }

    return null;
}

function getPreferredStyleSheet()
{
    return ('A-');
}

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 + style_cookie_settings;
}

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 load_cookie()
{
    var cookie = readCookie('style_cookie');
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
}

function unload_cookie()
{
    var title = getActiveStyleSheet();
    createCookie('style_cookie', title, 365);
}

onload_functions.push('load_cookie()');
onunload_functions.push('unload_cookie()');

/*
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
*/