function fontsizeup() {
		  active = getActiveStyleSheet();
		  switch (active) {
		    case 'unem' : 
		      setActiveStyleSheet('unodosem');
		      break;
		    case 'unodosem' : 
		      setActiveStyleSheet('unocuatroem');
		      break;
			case 'unocuatroem' : 
		      setActiveStyleSheet('unoochoem');
		      break;
			case 'unoochoem' : 
		      setActiveStyleSheet('unoochoem');
		      break;
		    default :
		      setActiveStyleSheet('unodosem');
		      break;
			  }
}

function fontsizedown() {
		  active = getActiveStyleSheet();
		  switch (active) {
		    case 'dosem' : 
		      setActiveStyleSheet('unoochoem');
		      break;
		    case 'unoochoem' : 
		      setActiveStyleSheet('unocuatroem');
		      break;
			case 'unocuatroem' : 
		      setActiveStyleSheet('unodosem');
		      break;
			case 'unodosem' : 
		      setActiveStyleSheet('unem');
		      break;
		    default :
		      setActiveStyleSheet('ikerlan');
		      break;
		}
}

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() {
		  return ('unem');
}

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;
}

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

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

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (title == 'null') {
		  title = getPreferredStyleSheet();
}

setActiveStyleSheet(title);*/