conditional display of html element forms

Question

Well, after a one hour introduction to javascript, I ve come up with the following code. It did what I wanted alright, but then I wanted something else and it wont work.

Answer 1

This line:

document.getElementById("cont1").style.visibility="hidden";

Adds this:

style="visibility: hidden;"

to this:

to make it look like this:

You can do this yourself, just by adding that attribute to your html tag.

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Oh yeah, and this:

is the same as this: