/**
* 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);
}