// When the Site Index page is loaded, init() check all the cookies
// If there are cookies set, this loop through all the cookies and extract the id of the divs
// that were being viewed then display them
function init() {
    //delete_all_cookies();
    var cookieString,cookieArray,cookie,i,id,element;
    cookieString = document.cookie;
    
    if(cookieString) {
         cookieArray = cookieString.split("; ");
        for (i = 0; i < cookieArray.length; i++) {
            cookie = cookieArray[i].split("=");
            if(cookie.length != 2) continue;
            id = cookie[0];
            element = document.getElementById(id);
            if (element) element.style.display = '';
        }
    }
}

// This function displays/hides the clicked div and set/erase the cookie indicating its status
function swap(id) {
    var element = document.getElementById(id);
    if (element.style.display == 'none') {
      element.style.display = '';
      // If there wasn't a cookie for this, set a cookie indicating this div is opening
      if(!getCookie(id)) setCookie(id,'on');
    } else {
      element.style.display = 'none';
      // Erase the opening indicating cookie (this div is closed)
      if(getCookie(id)) deleteCookie(id);
    }
}
  
function setCookie ( name, value, exp_y, exp_m, exp_d, path, domain, secure ) {
  var cookieString = name + "=" + escape ( value );

  if ( exp_y ) {
    var expires = new Date ( exp_y, exp_m, exp_d );
    cookieString += "; expires=" + expires.toGMTString();
  }

  if ( path )
        cookieString += "; path=" + escape ( path );

  if ( domain )
        cookieString += "; domain=" + escape ( domain );
  
  if ( secure )
        cookieString += "; secure";
  
  document.cookie = cookieString;
}

function deleteCookie ( cookieName ) {
  var cookieDate = new Date ( );
  cookieDate.setTime ( cookieDate.getTime() - 1 );
  document.cookie = cookieName += "=; expires=" + cookieDate.toGMTString();
}

function delete_all_cookies ()
{
	// Get cookie string and separate into individual cookie phrases:
	var cookie_string = "" + document . cookie;
	var cookie_array = cookie_string . split ("; ");

	// Try to delete each cookie:
	for (var i = 0; i < cookie_array . length; ++ i)
	{
		var single_cookie = cookie_array [i] . split ("=");
		if (single_cookie . length != 2)
			continue;
		var name = unescape (single_cookie [0]);
		delete_cookie (name);
	}
}

function getCookie ( cookieName ) {
  var results = document.cookie.match ( '(^|;) ?' + cookieName + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}

YAHOO.util.Event.onDOMReady(init);