function setActiveStyleSheet(title) {
   if (    ! title
        || ! document.getElementsByTagName 
        || ! document.getElementsByTagName("link") ) { 
     return;
   }
   var i, a;
   var links = document.getElementsByTagName("link");
   if ( !links.length ) return;

   for ( i=0; links.length > i; i++ ) {
     a = links[i];
     var linktitle = a.getAttribute( 'title' );

     if ( a.getAttribute("rel").indexOf("style") != -1
          && linktitle ) {
       a.disabled = true;
 
       if ( linktitle == title ) {
          a.disabled = false;
          setCookie("style", title, 365, '/');

       } else {
       }
     }
   }  
}

function setActiveStyleSheetA(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title)
		a.disabled = false;
    }
  }
  createCookie("style", title, 365);
}

function getActiveStyleSheet() {
	var i, a;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled)
			return a.getAttribute("title");
	}
	return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookieA(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function setCookie( name, value, days, path, domain ) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();

  } else {
    expires = "";
  }
  document.cookie = name+"="+ escape(value) 
     + expires
     + ( path ? "; path="+path : "" )
     + ( domain ? ";domain="+domain : "");
}

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 getCookie( name ) {  // from meetup.com/scripts/global.js
  var start = document.cookie.indexOf( name + "=" );
  var len = start + name.length + 1;
  if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
    return null;
  }
  if ( start == -1 ) return null;
  var end = document.cookie.indexOf( ";", len );
  if ( end == -1 ) end = document.cookie.length;
  return unescape( document.cookie.substring( len, end ) );
}

function init_set_style () { 
  var cookie = getCookie("style");
  if (cookie) {
    setActiveStyleSheet (cookie);
  }
}

init_set_style();
addLoadEvent( init_set_style );


/******   installation tool   *****************/         

// from http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof oldonload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            oldonload();
            func();
        }
    }
}

/*
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
*/