session在Firefox下的错误
session在Firefox下的异常
自己写了一个购物车的程序，很奇怪的是，在不同浏览器下的结果不同。按说这个是服务器端的代码，和浏览器无关的。具体症状是，在Firefox和Opera下更新购物车里的物件的数目后，Session就会变空。而且，添加一个物品后，数目为1.但是在添加后，再回来看购物车，数目就变成2了。同样的操作在IE和Chrome,Safari下都是好的。不知道有没有人遇到这样的情况。
网站的链接为：(不知道直接发链接是否合适，如果不合规定，就请管理员删除下面的内容)
http://www.qtbox.co.uk
访问下面的链接，可给购物车中加入一个物件：
http://www.qtbox.co.uk/cart.php?action=add&pid=qt2010&x=47&y=14
再加入后，直接在浏览器地址中输入：
http://www.qtbox.co.uk/cart.php
会发现在IE里是正常的，在Firefox里就会变成2. 而且持续添加新的物件，除了最后一个物件是1，其他都会变成2.
还有就是，不能更新数目，如果更新后，购物车的session就会变空。
请高手解释一下为什么会出现这样的状况？
------解决方案--------------------
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