Good Morning!
Halloween image is ghoul.gif
Edit the URL by adding "?image=imageName" to the end of it.
The imageName can be; moonwitch or linejack or ghoul.
Here are the possible links to display the images:
https://www.cs.ryerson.ca/~s3kullar/lab08/lab08.php
https://www.cs.ryerson.ca/~s3kullar/lab08/lab08.php?image=moonwitch
https://www.cs.ryerson.ca/~s3kullar/lab08/lab08.php?image=linejack
https://www.cs.ryerson.ca/~s3kullar/lab08/lab08.php?image=ghoul