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// replace the first image we see with a cat
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document.images[0].src = 'http://thecatapi.com/api/images/get?format=src&type=gif';
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​
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// replace the google logo with a cat
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document.getElementById('lga').innerHTML = '<a href="http://thecatapi.com"><img src="http://thecatapi.com/api/images/get?format=src&type=gif"></a>';
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​
xxxxxxxxxx
1
 
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body {
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    background-color: skyblue;
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}
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​