dddropdownpanel.js: target is null

[jeroenNN]

1) Script Title: DD Drop Down Panel

2) Script URL (on DD): http://www.dynamicdrive.com/dynamici...pdownpanel.htm

3) Describe problem:
Hi, when adding two panels to one page, I get the error below. Can someone help me to fix this? Many thanks.

Error: target is null
Source File: http://192.168.172.54/js/dddropdownpanel.js
Line: 27

To visit the site (you do not have to login to see the error) go to http://217.170.32.40:8082 . You will be forwarded to the site.

[Snookerman]

The JavaScript file doesn't exist.

[jeroenNN]

Sorry, I don't understand your comment. The script is included in the header and the panel is working fine, but creates an error.

[Snookerman]

This file does not exist: http://192.168.172.54/js/dddropdownpanel.js

You need to fix that.

[jeroenNN]

The JavaScript file doesn't exist.

Thank you for your reply. I think the file does exist. To visit the site go to http://217.170.32.40:8082. You will be forwarded to the site on 192.168.172.54.

If I visit the page the both panels are working (one in the top, one tabel in the center of the screen), but one of them generates a javascript error. Chorme and FF are hiding the error but IE shows up a pop-up...