Cookie无法在不同的浏览器中运行

I finally got my code working for a password protect script. It's still in its infancy, so I understand it isn't secure. My problem is that I seem to have problems across a number of different computers and browsers. From what I've seen, firefox has no problem with the cookies being set. I'm running into trouble on certain machines not setting cookies.I finally got my code working for a password pr