please just get me started?

Sorry to be dim but I’ve followed the instructions carefully to set up my first dhtmlxGantt chart on my webpages but it won’t start.
Done something fundamentally wrong, or not grasped fundamental principles probably but can anyone just help me get started please?
The issue is that the simple gantt chart I’ve created, which should exactly mimic the one in the instructions, just doesn’t appear on the webpage I’ve created for it;
Perhaps someone could have a quick look at the code by viewing the page source and give me a hint that can help make it work?
Many thanks in advance.
ad1281 = Andrew Southampton UK
Here’s the link to my page:

Apologies all - I fixed it - simple typo - put a ‘.’ instead of a ‘_’
Yup - definitely dim!