If you have to draw each frame of a 30-second animation, even at 15 fps, you won??™t have time for other
work. Dreamweaver uses the concept of keyframes to make a simple AP element movement workable. Each
keyframe contains a change in the timeline object??™s properties, such as position. For example, suppose you
want your AP element to start at the upper left (represented by the coordinates 0,0) and travel to the lower
right (at 750,550). To accomplish this task, you need only specify the AP element??™s position for the two
keyframes??”the start and the finish??”and Dreamweaver generates all the frames in between.
Timelines have three primary roles:
n A timeline can alter an AP element??™s position, dimensions, visibility, and depth.
n Timelines can change the source for any image on a Web page and cause another graphic of the
same height and width to appear in the same location.
n Any of Dreamweaver??™s JavaScript behaviors can be triggered on any frame of a timeline.
A few ground rules
Keep the following basic guidelines in mind when you??™re using timelines in the Web pages you create with
Dreamweaver:
n Timelines require a 4.0 or later browser.
n When testing locally on Internet Explorer 6 or 7 on Windows XP with Service Pack 2 or Internet
Explorer 7 on Vista, the browser blocks the active content as a security measure.
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