Q:

Check if a Cookie exists or not?

I am trying to find out if a cookie exists or not, if it doesn't I want to create it. I am doing this in Internet Explorer and its stopping at if(readCookie(count) == null) of the code below. 
if(readCookie("count") == null)
{
    createCookie("count", 0, 10);
}

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;
}

What am I doing wrong here?

A:

Try using undefined instead of null
See the following link:
http://jsfiddle.net/sssonline2/D38WM/1/
Tested on both IE and FireFox
Here's a Stack Overflow link for more info:
typeof !== "undefined" vs. != null

