/**
 * 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: end of current session)
 * [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)
{
    document.cookie= name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.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";
    }
}

// Copyright (c) 2005 Dirk Steins (http://www.dirksteins.de)
//
// This is an extension for some box layout stuff
// using prototype and scriptaculous


/*
 * Toggle up/down state of a box and set the 
 * cookie storing the state of the box
 * 
 * id       id of box element
 * imgid    id of image to swap
 * up       img src for up image
 * down     img src for down image
 */
function updown(id, imgid, up, down)
{
	// get state
	var visible = true;
	var image;
	
	var expires = new Date();
	// set cookie expiration to one year in advance
	expires.setFullYear(expires.getFullYear() + 1);

	image = document.getElementById(imgid);
	if (Element.visible(id))
	{
		// hide it
		Effect.BlindUp(id,{duration: 0.5});
		// change image
		
		image.src = up;
		image.alt = "Expand";
		image.title = "Expand";

		// save state in cookie
		setCookie(id + "_state", 1, expires, "/");
	}
	else
	{
		// show it
		Effect.BlindDown(id,{duration: 0.5});
		// change image
		image.src = down;
		image.alt = "Collapse";
		image.title = "Collapse";

		// save state in cookie
		setCookie(id + "_state", 2, expires, "/");
	}
}

/**
 * Checks the up/down state of a box from the cookie
 * and sets the images and box state accordingly
 */
function checkState(id)
{
	var value = getCookie(id + "_state");
	// get id of image
	var subIdx = id.lastIndexOf("_");
	var imgId = id.substring(0, subIdx) + "_arrow";
	if (value == 1)
	{
		var element = $(id);
		element.style.display = 'none';
		var image = $(imgId);
		image.src = imgUp;
		image.title = "Expand";
		image.alt = "Expand";
	}
}

/**
 * Checks the up/down state of all boxes,
 * called after page load
 */
function checkBoxStates()
{
	// find all divs with class boxcontent
	// alert("Checking state of boxes");
	var elements;
	elements = document.getElementsByTagName('div');
	for (var i = 0; i < elements.length; i++)
	{
		var div = elements[i];
		if (div.className && div.className.match(new RegExp('\\b'+"boxcontent"+'\\b')))
		{
			checkState(div.id);
		}
	}
}

// check state of all boxes after page load
Event.observe(window, 'load', checkBoxStates, false);