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1 Open the graphic in your graphics program, and use the program s selection tools to
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work out the coordinates of the areas you will need to define within the image For example, the coordinates "0,0,320,240" define the upper-left quarter of the sample graphic
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2 Type the <img/> tag with the src attribute specifying the graphic file, the alt attribute
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specifying the alternative text, and the usemap attribute specifying the name of the map you ll create for example:
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<img src="map1jpg" alt="picture showing Acme Virtual Industries main service areas" usemap="#map1_map">
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Type the opening <map> tag, and set the name attribute to the name you used for the usemap attribute of the <img/> tag for example:
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<map name="map1_map">
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Type an <area> tag with the href attribute specifying the destination page for the hyperlink, the alt attribute specifying the alternative text for the hyperlink (if desired), the shape attribute specifying the type of area (rect, circle, or poly), and the coords attribute specifying the coordinates of the area For example, this code defines a rectangular area 320 pixels wide by 240 pixels high, starting at the upper-left corner of the graphic:
<area href="financehtml" alt="Financial Services" shape="rect" coords="0,0,320,240">
Enter <area> tags for the other areas in the graphic for example:
Figure 5-6: You can use a graphic with two or more distinct areas to create an imagemap with links to different pages from different parts of the graphic
<area href="officeshtml" alt="Office Services" shape="rect" coords="0,240,320,240"> <area href="securityhtml" alt="Security Services" shape="rect" coords="320,0,640,240"> <area href="computinghtml" alt="Computing Services" shape="rect" coords="320,240,640,480">
Type the closing </map> tag:
</map>
Save the page, switch to your browser, and then refresh the display so that you can see the change
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Figure 5-7 shows the page and imagemap produced by the sample code shown here:
<h1>Acme Virtual Industries Market Segments</h1> <p>Click the market segment for which you'd like to see information</p> <img src="map1jpg" alt="picture showing Acme Virtual Industries main service areas" usemap="#map1_map"> <map name="map1_map"> <area href="http://wwwacmevirtualindustriescom/ financehtml" alt="Financial Services" title="Financial Services" shape="rect" coords="0,0,320,240"> <area href="officeshtml" alt="Office Services" title="Office Services" shape="rect" coords="0,240,320,480"> <area href="securityhtml" alt="Security Services" title="Security Services" shape="rect" coords="320,0,640,240"> <area href="computinghtml" alt="Computing Services" title="Computing Services" shape="rect" coords="320,240,640,480"> </map>
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Figure 5-7: Using title text with your imagemaps gives visitors an idea of what they ll see if they click a particular part of the imagemap
Creating an imagemap manually takes some time and patience, not to mention some accurate typing of coordinates Many graphics programs include tools for creating imagemaps automatically, so check to see if your graphics program has this feature This automation is particularly valuable for creating complex imagemaps, such as those that use polygons
Add Audio and Video to Your Web Pages
Now that broadband is widely available, more and more people can enjoy audio and video via the Web If you have audio or video content to share, you can put it on your website You can create links that allow users to download audio or video files, play audio or video files in a separate player, or play audio or video files within your web page
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Understand Audio and Video Formats
Computers use various audio and video formats, some of which are much more widely used than others To make sure that as many visitors to your website as possible can enjoy its audio or video, you need to choose a suitable format You must also ensure that the file size of the audio or video is small enough that the file can be downloaded over even a dial-up connection Use compressed audio formats for all but the shortest audio files Most computers can play MP3 files (which are compressed) and WAV files (which are not compressed) Also, consider reducing the complexity of the audio file for example, by reducing it from a 16-bit sound to an 8-bit sound, or by using mono instead of stereo The file will not sound as good, but visitors to your website will be able to get it that much more quickly Video contains far more data than audio, so always use compressed formats for video even for the shortest files Most computers can play AVI (audio-video interleave) files, which offer modest compression, and MPEG files, which offer better compression Most Windows computers can play Windows Media Video (WMV) files, which also use a compressed format Any PC or Mac with iTunes installed can also play files in the QuickTime movie formats Most digital video camcorders export video at VGA resolution (640 480 pixels) or a high-definition resolution VGA gives good video quality, but produces large files; high-definition gives great quality, but produces huge files Reduce the resolution for video files you put on the Web to 320 240 pixels for reasonable quality, 240 160 pixels for acceptable quality, or 160 120 pixels for low quality
On most versions of Windows, you can use the builtin Sound Recorder application to save a WAV file to a compressed format that will take less time to download On Mac OS X, use GarageBand if you have the iLife
application suite For more control on Windows, Mac OS X, or Linux, try the free audio program Audacity (http:// audacitysourceforgenet)
On the PC, you can use Windows Movie Maker, which is included with most versions of Windows, to change video resolution On the Mac, use iMovie if you have the iLife application suite
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