Overlay using jquery or javascript

[ayusininfotech]

I am working on http://ywisdom.com/www.goldbusinesscardselect.com/

In this url overlay page comes on the top of the page even.
I need the overlay to come at the pointer position of my page when i scroll down, so that it will be at the line of my scrolling position. (without using style=position: fixed)
Not sure how to use jquery or javascript for it.

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