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The document object has several important subobjects including Anchor, Applet, Area, Form, Image, and Link
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It also has arrays anchors, applets, forms, images, and links holding all occurrences of these objects for a particular document
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We have already illustrated Form and Link; here we look at Image
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The tag <IMG NAME="fred" SRC="jim.gif"> in an HTML file generates an object document.fred of type Image with property document.fred.src="jim.gif"
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One can preload an image using the statement:
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image1 = new Image(); image1.src = "henry.jpg";
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and then change an image in the document using:
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document.fred.src = image1.src;
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Note the image is fetched from cache, so this is fast!
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This technique can be used for animated images, for example
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