<!--

/**
 * Read the JavaScript cookies tutorial at:
 *   http://www.netspade.com/articles/javascript/cookies.xml
 */

/**
 * Sets a Cookie with the given name and value.
 *
 * name       Name of the cookie
 * value      Value of the cookie
 * [expires]  Expiration date of the cookie (default: 30 days from now)
 * [path]     Path where the cookie is valid (default: path of calling document)
 * [domain]   Domain where the cookie is valid
 *              (default: domain of calling document)
 * [secure]   Boolean value indicating if the cookie transmission requires a
 *              secure transmission
 */
function setCookie(name, value, expires, path, domain, secure)
{
	// Set the default to 30 days from now.
	var now = new Date();
	now.setTime(now.getTime() + 1000 * 60 * 60 * 24 * 30);

	document.cookie= name + "=" + escape(value) + "; expires=" + 
		((expires) ? expires.toGMTString() : now.toGMTString()) +
		((path) ? "; path=" + path : "") +
		((domain) ? "; domain=" + domain : "") +
		((secure) ? "; secure" : "");
}

/**
 * Gets the value of the specified cookie.
 *
 * name  Name of the desired cookie.
 *
 * Returns a string containing value of specified cookie,
 *   or null if cookie does not exist.
 */
function getCookie(name)
{
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1)
    {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    }
    else
    {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
    {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

/**
 * Deletes the specified cookie.
 *
 * name      name of the cookie
 * [path]    path of the cookie (must be same as path used to create cookie)
 * [domain]  domain of the cookie (must be same as domain used to create cookie)
 */
function deleteCookie(name, path, domain)
{
    if (getCookie(name))
    {
        document.cookie = name + "=" + 
            ((path) ? "; path=" + path : "") +
            ((domain) ? "; domain=" + domain : "") +
            "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}



function setActiveStyleSheet(title)
{
	var x, i, a;

	if (document.getElementsByTagName)
		x = document.getElementsByTagName('link');
	else if (document.all)
		x = document.all.tags('link');
	else
	{
		return;
	}

	for(i = 0; i < x.length; i++)
	{
		a = x[i];
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title"))
		{
			a.disabled = true;
			if(a.getAttribute("title") == title)
				a.disabled = false;
		}
	}
}

function determineScreenResolution()
{
	var c = getCookie("graphics");
	
	if(c != null)
	{
		if(c == "use_graphics")
		{
			if ((screen.width >= 1024) && (screen.height >= 768))
				setActiveStyleSheet("medium_resolution");
			else 
				setActiveStyleSheet("low_resolution");
		}
		else
		{
			setActiveStyleSheet("very_low_resolution");		
		}
	}
	else
	{
		if ((screen.width >= 1024) && (screen.height >= 768))
			setActiveStyleSheet("medium_resolution");
		else if((screen.width >= 800) && (screen.height >= 600))
			setActiveStyleSheet("low_resolution");
		else
			setActiveStyleSheet("very_low_resolution");
	}
}

-->