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Preferences options merely customize the initial look of the layer when it's inserted for the first time.   A complete list of functionality


exposed by the Layers category is given here: Visibility: Choose an option from this menu to set the initial display properties of the layer. Options include Default, Inherit, Visible, and Hidden. Again, you will learn more about these options in Chapter 11. Width: Sets the initial width in pixels of the layer when it's first inserted into the Document window. Height: Sets the initial height in pixels of the layer when it's first inserted into the Document window. Background color: Sets the initial background color of the layer when it's first inserted into the Document window. Background image: Sets the initial background image of the layer when it's first inserted into the Document window. If a background image is set and is smaller than the specified width and height of the layer, the image tiles vertically and horizontally. Nesting: Enable this option to automatically nest a layer within another layer if the second layer is initially created within the boundaries of an existing layer. Disabling this option causes the layer to stack instead of nest. Netscape 4 compatibility: Enable this option to allow Dreamweaver to automatically insert JavaScript code within the <head> tag of the web page to fix a known problem in Netscape 4 browsers that automatically causes a layer to lose its positioning values if a user resizes the browser window. Alternatively, you can manually add/remove this code by choosing the Add/Remove Netscape Resize Fix option from the Commands menu. The Layout Mode Category In general, Dreamweaver supports two development modes: Standard and Layout. Up until now, you've been using the Standard mode for developing your web pages. In Chapter 6, "Web Page Structuring Using Tables," we'll examine the Layout mode with much more detail. In support of that chapter, you can set layout preferences in the Layout category of the Preferences window, shown in Figure 5.16, to customize the look of elements exposed by the Layout mode. Figure 5.16. Use the Layout category to customize the look of elements exposed by the Layout mode. [View full size image]   A complete list of functionality exposed by the Layout Mode category is given here: Autoinsert spacers: Choose the When Making Autostretch Tables option to insert a spacer image to control the width, the height, or both of a table cell. Choose the Never option if you'd prefer not to have Dreamweaver automatically add the spacer image to your table. Spacer image for site: Choose a defined site from this menu to set the spacer image in the Image File text box for a specific site. Image file: Click the Browse button to search for an existing spacer image file or click Create to have Dreamweaver create a 1 x 1 pixel transparent GIF in your selected site. NOTE Spacer images are discussed with more detail in Chapter 6.   Cell outline: Choose from this color picker to set the color of the outlines of layout cells. Table outline: Choose from this color picker to set the color of the outlines of layout tables. Table background: Choose from this color picker to set the color used for areas of layout tables where there are no layout cells. The New Document Category