function handleMenu(){
	if (document.getElementById('warwickMenu').style.visibility!='visible'){
		turnMenuOn();
		createCookie('warwickMenu','on','365');
	} else {
		turnMenuOff();
		createCookie('warwickMenu','off','365');
	}
}

function turnMenuOn(){
	document.getElementById('warwickMenu').style.visibility='visible';
	document.getElementById('warwickNavButton').src='/newbrands/standard/images/warwickminus.gif';
}

function turnMenuOff(){
	 if (document.getElementById('warwickMenu')){
        document.getElementById('warwickMenu').style.visibility='hidden';
     }
     if (document.getElementById('warwickNavButton')){
     	document.getElementById('warwickNavButton').src='/newbrands/standard/images/warwickplus.gif';
     }
}

window.onload = function(e) {
 	var cookie = readCookie('warwickMenu');
	if (cookie=='on'){
		turnMenuOn();
	} else {
		turnMenuOff();
	}
}

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=/;domain=warwick.ac.uk";
}

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;
}