[Zope] "Save Changes" executes Python script

Hi, We have written a Python script that sends a mail. Everytime we modify this script with Firefox 1.0.4 in Windows and click "Save Changes", the script is saved and executed. So everytime we receive a mail. This does not happen when we modify the script with Internet Explorer or Firefox 1.0.4 in Linux. Does anyone know about this problem? Bert...