The script below demonstrates an xml parse error that occurs in IE but not FF. Assuming the xml is parsed correctly, you should see an alert with the title of the one book in the xml document. If the parse fails, you will get a parseerror alert. This file and accompanying xml work fine in firefox, whather the files are remote (served by http) or local. They also work fine in IE if the files are remote. However, if the files are stored locally, IE will generate a parseerror.