You can create JavaScript for a specific lightbox. Here’s how:

1. First, create a Custom JS Box by selecting that option from the dropdown menu under your account name:
2. Then add the Box ID to specify which Box it is for:  If you don’t specify a Box ID, it includes all your boxes. The Box ID is a 6-digit ID located to the left of your box names.
3. You can also use the “Exclude” option to use the JavaScript for all your boxes except a specific one.

Related Reading:

• Global Custom JavaScript: Reuse JavaScript Across Multiple Accounts
• Custom JS Versioning