php 显示数据库数据有关问题

php 显示数据库数据问题
http://zenit.senecac.on.ca/~int322_122b20/assign1/zjzhang1_a1_view.php?box=%22y%22
这是我的网页
 如果我点on sale这个链接 怎么只显示sale item = y的数据

------解决方案--------------------
Authorization Required

This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.

如果是链接,那么你可以在 链接自己加上传递嘛

http://xxxx.com/?item=y

传递过去了爱干啥不就干啥
------解决方案--------------------
GET参数走进去。