function getCookieVal(offset)
			{
				var endstr=document.cookie.indexOf (";", offset);
				if (endstr==-1) endstr=document.cookie.length;
				return unescape(document.cookie.substring(offset, endstr)); 
			}
			
			function LireCookie(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) return getCookieVal(j);
					i=document.cookie.indexOf(" ",i)+1;
					if (i==0) break;			
				}
				return null; 
			}
			
			function PoseCookie(nom,valeur,path)
			{
				document.cookie = nom+" = "+valeur+"; path="+path;
			}
			
			ID_cookie = LireCookie('I');
			if(!ID_cookie)
				ID_cookie="";