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    copied!<p>A better way to do this is to use media targeting, rather than JavaScript.</p> <p>Done correctly, the iPhone will only ever retrieve the image appropriate to its screen size and pixel ratio, so there is no need to resort to JavaScript.</p> <h1>Media Targeting</h1> <p>This works for iPhones;</p> <pre><code>&lt;!-- iPhone 2G, 3G, 3GS --&gt; &lt;link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 480px)" href="apple-touch-startup-image-320x460.png"&gt; &lt;!-- iPhone 4, 4S --&gt; &lt;link rel="apple-touch-startup-image" media="(-webkit-device-pixel-ratio: 2) and (device-width: 320px) and (device-height: 480px)" href="apple-touch-startup-image-640x920.png"&gt; &lt;!-- iPhone 5 --&gt; &lt;link rel="apple-touch-startup-image" media="(device-width: 320px) and (device-height: 568px)" href="apple-touch-startup-image-640x1096.png"&gt; </code></pre> <p>And for iPads;</p> <pre><code>&lt;!-- iPad 1, 2, Mini - Portrait --&gt; &lt;link rel="apple-touch-startup-image" media="(device-width: 768px) and (orientation: portrait)" href="apple-touch-startup-image-768x1004.png"&gt; &lt;!-- iPad 1, 2, Mini - Landscape --&gt; &lt;link rel="apple-touch-startup-image" media="(device-width: 768px) and (orientation: landscape)" href="apple-touch-startup-image-1024x748.png"&gt; &lt;!-- iPad 3, 4 - Portrait --&gt; &lt;link rel="apple-touch-startup-image" media="(-webkit-device-pixel-ratio: 2) and (device-width: 768px) and (orientation: portrait)" href="apple-touch-startup-image-1536x2008.png"&gt; &lt;!-- iPad 3, 4 - Landscape --&gt; &lt;link rel="apple-touch-startup-image" media="(-webkit-device-pixel-ratio: 2) and (device-width: 768px) and (orientation: landscape)" href="apple-touch-startup-image-2048x1496.png"&gt; </code></pre> <p>More information on these startup images can be found at <a href="http://stuffandnonsense.co.uk/blog/about/home-screen-icons-and-startup-screens" rel="nofollow">Stuff &amp; Nonsense</a>.</p> <p>This will cause the device to download only the image appropriate to it.</p> <h1>Measuring device height in JavaScript</h1> <p>If you <em>must</em> use JavaScript for any reason (and I do advise against it), you can retrieve the device's height with <code>window.screen.height</code>. On 3.5-inch devices, it will be <code>480</code>, and on 4-inch devices, it is <code>568</code>.</p> <p>For more information on measuring the viewport in JS, see <a href="http://responsejs.com/labs/dimensions/" rel="nofollow">ResponseJS' guide</a>.</p>
 

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