function setActiveStyleSheet(title) {
  var i, a, main, founded;
  var ini_title;
  if (title==null)
  	ini_title=title;
  else
  	ini_title=title.charAt(0);
  founded = false;
  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").charAt(0) == ini_title){
      	a.disabled = false;
   	founded = true;
      }
    }
  }
  if(!founded){
	  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {    
	      if(i == CSS_ID){
		a.disabled = false;
	      }
	    }
	  }
  }
}

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 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+"="+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;
}

TITLE_HC = '2.Alto Contraste';
TITLE_HT = '3.Texto grande';
CSS_ID = 1;

function dameEstilo() {
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	var ini_title;
	  if (title==null)
	  	ini_title=title;
	  else
  		ini_title=title.charAt(0);
	if (ini_title==TITLE_HC.charAt(0))
		title=2;
	else if (ini_title==TITLE_HT.charAt(0))
		title=3;
	else 
		title=1;
	return(title);
}

function changeStyleSheet(title, formname){
  createCookie("style", title, 365);
  document.forms[formname].submit();
}

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


function load_first(){
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
}

load_first();