function removeIntro(who) {
		if(typeof who== 'string') who=document.getElementById(who);
	    if(who && who.parentNode)who.parentNode.removeChild(who);
	}

	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 var 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;
	}

	function eraseCookie(name) {
		createCookie(name,'',-1);
	}