Have you checked that all the required files (scripts and css) have been uploaded to your site?

Also, make sure that the paths are right: Sometimes the path to the linked files is wrong because it's using a site relative path instead of a document relative one.

Do you see the required folders in your local version of the site?

Hi All:

From my experience with other people having problems with the widget, here are some things you can check when it doesn't work:

• Names with uppercase characters: Some servers don't see a difference between "images" and "Images" but most of them do: Check that the paths to the folders and files are correctly written. I encourage people to use always lowercase characters. Same applies to spaces (I prefer to use an underscore instead)
• "scripts" folder: I've also found that some servers don't allow a folder called "scripts". You should change both the folder name and the paths in the main document.
• Paths: This is the most common one: Make sure that the paths to the required files are correct. In theory, you shouldn't find this when the document is at the site root. If the document is inside a folder, sometimes files' location and related paths may vary. If you are using CS5 or above, a good trick is using the related files toolbar and check whether DW can find and open the files.
• Upload all the required files: Some users forget to upload the "lightbox" folder, located inside "images". That folder contains the images used by the lightbox to work (nav and close buttons, for example). And also check that the paths to those images is correct. In this case, you can edit the paths in the parameters that you will find in the script code added to the document (names are quite self explanatory and every param is commented, so this shouldn't be a problem)

I hope this helps.