A pop-up window is simply another resource for displaying content. Many advertisers abuse them, however, thus giving pop-up windows a bad reputation. They can be implemented in a friendly fashion that won't make your visitors angry -- and they can be very useful in certain circumstances, such as on an intranet. Alejandro Gervasio explains.
This way, if scripting is disabled, the standard link still works. The return false statement effectively cancels out the default action of the href section, so it won’t open the pop-up and the normal HTML windows at the same time. It will open one or the other. What’s more, if we want the window to open on top of the current window, just adding a target attribute will do the trick -- like so:
In order to solve accessibility problems, the most common approach is to inform the user that the link will open in a new window, include instructions as part of the link itself, and add notes in a title attribute or using proprietary icons to indicate that the link will open a pop-up window.