i'm building a website at the moment which has a login part to it. I am trying to create an overlay so that when a link is clicked, a form will appear over the page. and the rest of the website will turn a shade darker.
here's an example of what im looking for:
http://kissmetrics.com/
Top right hand corner theres a link to login.
How would i go about creating something like that? what kind of code will i need to use?
Thanks in advance!
~AF