MACROMEDIA FIREWORKS 2-USING FIREWORKS Use Manual page 84

To create a clipping path mask:
Position the object to be pasted in front of the
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destination path.
Cut the object to the Clipboard.
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Select a path inside which the object on the
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Clipboard is to be pasted.
Choose Edit > Paste Inside.
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The object on the Clipboard is pasted inside the
selected object in the same position from which it
was cut. The Object inspector identifies this
element as a clip group.
To create a mask similar to a layer mask:
Position two or more objects, one on top of the
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other, so that the top object is the object to be
used as the mask and the bottom object is the
object to be masked.
Select the objects.
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Choose Modify > Mask Group.
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The top object is converted to an alpha object whose
grayscale values are used to mask the bottom object.
Note: The top object need not be a path for this type of
masking. It can be an image.
Editing objects within a mask group
Subselect objects within a mask group to edit or
move them. Use the Subselection tool or double-click
the mask group handle to select the contents of the
mask group.
To convert a paste inside into a mask group, select
the paste inside, choose Window > Object, and then
choose Clip to Top Object' s Image.
To convert a mask group into a paste inside, select
the mask group, choose Window > Object, and then
choose Clip to Top Object' s Path.
84 Chapter 2