/*********  Manejo de cookies   ******/ 

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;
}


/*** CSS Switcher *************************************************************/
function setActiveStyleSheet(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;

    }

  }

}



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 initStyle(){

  var cookie = readCookie("style");

  var title = cookie ? cookie : getPreferredStyleSheet();

  setActiveStyleSheet(title);

}



function saveStyleCookie() {

  var title = getActiveStyleSheet();

  createCookie("style", title, 100);

}

/************************************************************* CSS Switcher ***/


/***************************************/
/*
function LeeFuente() {
  var cookie = readCookie("style");
  var title = cookie ? cookie : 'medio';
if(title != 'chico' && title != 'grande') title= 'medio';  
setActiveStyleSheet(title);
}

if (window.addEventListener)
window.addEventListener("load", LeeFuente, false)
else if (window.attachEvent)
window.attachEvent("onload", LeeFuente)
else if (document.getElementById)
window.onload=LeeFuente
*/

window.onload = function(e) {
  var cookie = readCookie("style");
 // var title = cookie ? cookie : getPreferredStyleSheet();
 var title = cookie ? cookie : 'medio';
 if(title != 'chico' && title != 'grande') title= 'medio';
  setActiveStyleSheet(title);
  }

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


/****************************************/

function agrandarFuente(){

var actual = getActiveStyleSheet();
switch(actual){
	case('grande'):
		setActiveStyleSheet('grande');
	break;
	case('medio'):
		setActiveStyleSheet('grande');
	break;
	case('chico'):
		setActiveStyleSheet('medio');
	break;
	default:
		setActiveStyleSheet('medio');
	break;
	}
saveStyleCookie();
}


function achicarFuente(){

var actual = getActiveStyleSheet();
switch(actual){
	case('chico'):
		setActiveStyleSheet('chico');
	break;
	case('medio'):
		setActiveStyleSheet('chico');
	break;
	case('grande'):
		setActiveStyleSheet('medio');
	break;
	default:
		setActiveStyleSheet('medio');
	break;
	}
saveStyleCookie();
}