// JavaScript Document
 function setActiveStyleSheet (titulo) {
 	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") == titulo) {
				a.disabled = false;
			}
		}
	}
}

function crearCookie (nombre, valor, dias) {
	if (dias) {
		var fecha = new Date();
		fecha.setTime(fecha.getTime()+(dias*24*60*60*1000));
		var expira = "; expires="+fecha.toGMTString();
	}
	else expira="";
	document.cookie = nombre+"="+valor+expira+"; path=/";
}

function leerCookie (nombre){
  var nameEQ = nombre + "=";
  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 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;
}