Problem deleting cookie

Question

I have a Login servlet that creates a cookie and when I log out I want my Logout servlet to delete it. I created the cookie easily but I am having trouble deleting it. I thought all I had to do was create another cookie with the same same and then set its max age to 0 but that doesn't seem to be working.

Answer 1

I just don't get it. My code is below if you have suggestions.
var allcookies = document.cookie;
//var allcookies2 = document.cookie;
var pos = allcookies.indexOf("counter=");
//var pos2 = allcookies2.indexOf("counter2=");
if(counter>1)
document.getElementById('button').style.visibility = "visible";
if(pos != -1)
     var start = pos + 8;
     var end = allcookies.indexOf(";", start);
     if(end == -1)
     end = allcookies.length;
var counter = allcookies.substring(start, end);
     counter = unescape(counter);
if(counter==1)
document.getElementById('button').style.visibility = "hidden";
counter=counter+1;