Registration Popup

[nevets2001uk]

I've posted this in the HTML topic as well but since they're may be vbscript envloved I thought i'd ask here as well!

I'm working on a company website and we would like to take details of the people who wish to view our documents. I have a page with a number of links to different documents. I would like the user to click on the link and get a registration popup if they have not provided details before. I would assume I need to use cookies to store whether they have registered before (How do i do that?) I would then like the popup to close once their information is filled in and they click a button. Then the main page should continue to load up the pdf document.

So in a more easy to read order here's what i'd like to know...

1) How to check whether the person has registered before from a cookie on their system
2) Create the popup window
3) After they have filled in information in the popup and hit the submit button place a cookie on their system so they don't have to do it again
4) Load up the correct document based on the original link which was clicked (ie only have to create one popup window for all links)and also close the popup window

Thanks for any advice

Steven G