/**
* Stylesheet toggle variation on styleswitch stylesheet switcher.
* Built on jQuery.
* Under an CC Attribution, Share Alike License.
* By Kelvin Luck ( http://www.kelvinluck.com/ )
**/

(function($)
  {
    // Local vars for toggle
    var availableStylesheets = [];
    var activeStylesheetIndex = 0;
    
    // To loop through available stylesheets
    $.stylesheetToggle = function()
    {
      activeStylesheetIndex ++;
      activeStylesheetIndex %= availableStylesheets.length;
      $.stylesheetSwitch(availableStylesheets[activeStylesheetIndex]);
    };
    
    // To switch to a specific named stylesheet
    $.stylesheetSwitch = function(styleName)
    {
      $('link[@rel*=style][title]').each(
        function(i) 
        {
          this.disabled = true;
          if (this.getAttribute('title') == styleName) {
            this.disabled = false;
            activeStylesheetIndex = i;
          }
        }
      );
      createCookie('style', styleName, 365);
    };
    
    // To initialise the stylesheet with it's 
    $.stylesheetInit = function()
    {
      $('link[rel*=style][title]').each(
        function(i) 
        {
          availableStylesheets.push(this.getAttribute('title'));
        }
      );
      var c = readCookie('style');
      if (c) {
        $.stylesheetSwitch(c);
      }
    };
  }
)(jQuery);

// cookie functions http://www.quirksmode.org/js/cookies.html
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 var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
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 eraseCookie(name) {
  createCookie(name,"",-1);
}
// /cookie functions