var tamanyoBody = 1;
function fijarTamanyo(tamanyo) {
  setCookie( "tamanyoLetra", tamanyo, 100, "/" );
  tamanyoTexto=tamanyo+'em';
  document.body.style.fontSize=tamanyoTexto;
}
function aumentarTamanyo() {
  var tamanyo=getCookie("tamanyoLetra");
  if (tamanyo==null)
	tamanyo=tamanyoBody+0.1;
  else if (tamanyo<1.4)
	tamanyo=eval(tamanyo)+0.1;
  fijarTamanyo(tamanyo);
}
function disminuirTamanyo() {
//deleteCookie("tamanyoLetra", "/");
  var tamanyo=getCookie("tamanyoLetra");
  if (tamanyo==null)
	tamanyo=tamanyoBody-0.1;
  else if (tamanyo>0.4)
	tamanyo=eval(tamanyo)-0.1;
  fijarTamanyo(tamanyo);
}
function iniciarTamanyo() {
  var tamanyo=getCookie("tamanyoLetra");
  if (tamanyo==null)
	tamanyo=tamanyoBody;
  fijarTamanyo(tamanyo);
}
function reestablecerTamanyo() {
  var tamanyo=tamanyoBody;
  fijarTamanyo(tamanyo);
}

function setCookie(name,value,days,path,domain,secure) {
  var expires, date;
  if (typeof days == "number") {
    date = new Date();
    date.setTime( date.getTime() + (days*24*60*60*1000) );
		expires = date.toGMTString();
  }
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

function getCookie(name) {
  var nameq = name + "=";
  var c_ar = document.cookie.split(';');
  for (var i=0; i<c_ar.length; i++) {
    var c = c_ar[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameq) == 0) return unescape( c.substring(nameq.length, c.length) );
  }
  return null;
}

function deleteCookie(name,path,domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}