Everything you need is on that page.

Look for the div called 'login_dialog', that's where the login forms are.

Then look at the javascripts and see how it's been done.

You have no other choice but to use javascript / dom scripting to achieve this effect to switch on and off the form overlay.

If the code is too complicated and you can't find what you want, try google search for 'css javascript hide show divs'. It should return examples/tutorials on how to do it.

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