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tedster - 8:10 pm on Jul 29, 2003 (gmt 0)
if document.layers ...will sniff out all Netscape 4 and only Netscape 4. Normally I wouldn't recommend sniffing for an object when you really want to sniff for the browser/user agent; but in this case it works well and it's the shortest code.
Netscape 4 is the only browser that supports the layers object.
So this line...