function readCookie(nom)
		{
			var arg=nom+"=";
			var alen=arg.length;
			var clen=document.cookie.length;
			var i=0;
			while (i<clen)
			{
				var j=i+alen;
				if (document.cookie.substring(i, j)==arg)
				{
					var endstr=document.cookie.indexOf (";", j);
					if (endstr==-1) endstr=document.cookie.length;
					return unescape(document.cookie.substring(j, endstr));
				}

				i=document.cookie.indexOf(" ",i)+1;
				if (i==0) break;
			}
			return null;
		}

		function writeCookie(nom, valeur)
		{
			var argv=writeCookie.arguments;
			var argc=writeCookie.arguments.length;
			var expires=(argc > 2) ? argv[2] : null;
			var path=(argc > 3) ? argv[3] : null;
			var domain=(argc > 4) ? argv[4] : null;
			var secure=(argc > 5) ? argv[5] : false;
			document.cookie=nom+"="+escape(valeur)+
			((expires==null) ? "" : ("; expires="+expires.toGMTString()))+
			((path==null) ? "" : ("; path="+path))+
			((domain==null) ? "" : ("; domain="+domain))+
			((secure==true) ? "; secure" : "");
		}

		function closeTip(){
			var tip = document.getElementById('menu_tip');
			tip.style.display = 'none';

			date=new Date;
			date.setMonth(date.getMonth()+2);
			writeCookie('tip','1', date);
		}