I guess that XMLHttpRequest can work on this issue, but this code:

---
xmlHttp.open("GET", "01.swf", false);
xmlHttp.send();
return xmlHttp.status == 0;
---

totally can't work in Chrome(though "01.swf" exactly exists, I get
"ETWORK_ERR: XMLHttpRequest Exception 101").
In Firefox, it works if "01.swf" exists. If not, I get "Access to restricted
URI denied" code: "1012".

I believe javascript can know whether a file exists, but how?

-- 
Lai, Yu-Hsuan
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