Do you mean a static popup (containing html and images) or one of EPiServer's modal dialogues?
Thank you Arild. That was what I was looking for. I will have a look at what Google says, and try :)
My customer wants a page to be displayed "on top of" another page (like a pop up or a modal dialog), when the user clicks a link. What is the best way to implement this in Episerver CMS6?