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Error: 'left' is null or not an object

Question
When trying to show a layer using Layer Genie, I get the following error: "Error: 'left' is null or not an object" Answer
This error usually occurs when you have assigned the same name/ID to more than one HTML element on your page. But then Layer Genie doesn't know which element to handle.

Element names/ID's must always be unique within a page!

Marja Ribbers-de Vroed

Marja Ribbers-de VroedWell, what's there to tell?

I worked as a software engineer for a well-known Dutch software company for about 10 years. But then I decided I did not want to work there anymore.
Since then, I've been working with my husband in our own company.

I "discovered" web development early 2000, and I soon found out that I could actually create my own extra (DHTML) features in Dreamweaver by building custom extensions.
My first extension was Cross-browser AutoScroller, but I've developed several other ones since then.

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