Flash MX 2004.
fl.findDocumentIndex(name)
name The document name for which you want to find the index. The document must be open.
An array of integers that represent the position of the document name in the fl.documents array.
Method; returns an array of integers that represent the position of the document name in the fl.documents array. More than one document with the same name can be open (if the documents are located in different folders).
The following example displays information about the index position of any open files named test.fla in the Output panel:
var filename = "test.fla"
var docIndex = fl.findDocumentIndex(filename);
for (var index in docIndex)
fl.trace(filename + " is open at index " + docIndex[index]);