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

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

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

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 expires = "";
  document.cookie = name+"="+escape(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 externalLinks() {
	if (!document.getElementById || !document.createTextNode || !document.domain) return;
	cloneLinks('canvasmain');
	cloneLinks('canvasright');
	cloneLinks('footer');
	// 2007-11-22 [asantos] Added to navleft
	cloneLinks('navleft');
}

function cloneLinks(container){
	var l = document.getElementById(container).getElementsByTagName('a');
	for (var i = 0; i < l.length; i++) {
		// just for off-site links
			
		if (l[i].href.indexOf('mailto:')<0 && l[i].href.indexOf('/')>0 && l[i].href.split('/')[2].replace(/www\./, '') != document.domain.replace(/www\./, '') && !l[i].getAttribute('target') && !l[i].parentNode.id.match(/^copy/) /**TEMPORAL**/&& l[i].href.indexOf('http://blogs.eps.uspceu.es/noticias/2008/11/28/1227906853259.html')<0 && l[i].href.indexOf('http://blogs.eps.uspceu.es/noticias/2008/12/02/1228240644077.html')<0/**hasta aqui**/) {

			// create new elements
			var nwl = document.createElement('a');
			var nwl_image = document.createElement('img');
			var space = document.createTextNode(' ');

			// setup image attributes
			nwl_image.setAttribute('src', '/css/common/nwl.png');
			nwl_image.setAttribute('alt','abrir enlace en nueva ventana');
			nwl_image.setAttribute('title', 'Abrir enlace en una nueva ventana');

			// set link attributes
			nwl.setAttribute('href', l[i].getAttribute('href'));
			nwl.setAttribute('target', '_blank');
			nwl.setAttribute('title', 'Abrir enlace en una nueva ventana');
			nwl.className = 'nwl';

			// append new elements
			nwl.appendChild(nwl_image);
			l[i].parentNode.insertBefore(space, l[i].nextSibling);
			l[i].parentNode.insertBefore(nwl, l[i].nextSibling.nextSibling);
		}
	}
}

function init() {
  pageId = getPage();
  contentId = getContent();
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  preloadImages();
  preloadFrontImages();
  externalLinks();  
}

function destroy() {
  var title = getActiveStyleSheet();
  if(title.indexOf('_print') == -1 ) createCookie("style", title, 365);
}

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