/**
* 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($)
   {
      var availableStylesheets = [];
      var activeStylesheetIndex = 0;
      
      $.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, 30);
      };
      
      $.stylesheetInit = function()
      {
         $('link[rel*=style][title]').each(
            function(i) 
            {
               availableStylesheets.push(this.getAttribute('title'));
            }
         );
         var c = readCookie('style');
         if (c) {
            $.stylesheetSwitch(c);
         }
      };
   }
)(jQuery);

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 = "1";
   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);
}