function writeCookie(name, value, days){
		if(days){
			(time = new Date()).setTime(new Date().getTime()+days*24*60*60*1000);
			var exp = '; expires='+time.toGMTString();
		}else{
			var exp='';
		}
		document.cookie=name+"="+value+exp+"; path=/";
	}


	function readCookie(name){
		var cookies = document.cookie.split(';');
		for(var i=0; i<cookies.length; i++){
			var cookie=cookies[i].replace(/^\s+/, '');
			if (cookie.indexOf(name+'=')==0) return cookie.substring(name.length+1);
		}
		return null;
	}

	function eraseCookie(name){
		writeCookie(name, "", -1);
	}