Last week, we had the author of TDD for a Shopping Website LiveProject. Friday at 11am Ranch time, Steven Solomon will be hosting a live TDD session just for us. See for the agenda and registration link
You can use DIV (in IE) or layers (in netscape) and set their visibility to hidden. Set their position to absolute. Then on some event, show them. I use onMouseDown and I check the button property of the evenet object. If it is 2, then it was a right click, and I show my DIV by setting its visibility to visible.