HTML-encoded topics:

Selecting this option generates popup topics as normal topics without headers – i.e. they are no longer popup topics. When this mode is activated links to popup topics will display the topics in the main browser window in the topic pane.

JavaScript popups:

This mode outputs popup topics using JavaScript code that allows you to use  formatted text (bold, italics etc.), images, topic hyperlinks, Internet links, tables (with grid lines and borders) and even video files in your popups.

Click/mouseover:

Displays the popup on user click or mouseover (i.e. as soon as the user moves the mouse pointer over the link). Be careful with using the mouseover option as many users find this intrusive and it may also trigger popup blockers in some browsers.

Minimum width:

Setting this to 0 makes the popup width automatic, on the basis of the amount of text and/or other content.

Setting it to any other value (in pixels) explicitly defines the width of the popup. If the popup only contains text it will have the width you specify. If it contains other content (graphics, videos) it will be at least as wide as the specified width and wider if required by the content.

Border width:

Enter 0 for no border, any value above 0 (in pixels) to draw a border around the popup box.

Border padding:

The distance between the popup content and the border or edge of the popup (if there is no border) in pixels.

Background:

The background color of the popup box.

Border color:

The color of the border, if there is one.

Visual effects:

These effects are only supported by MS Internet Explorer. This means that they are available in HTML Help (which uses MSIE) and in  Webhelp when the user is using Internet Explorer. They are ignored by all other browsers.

These effects are easier to see than to describe. Experiment! (Note that the transition effects are only for opening the popup box. The popups always close in the same way, no matter what effect you select.)