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    <p>I see several problems with your code:</p> <ul> <li><code>xnow</code> contains a string in this format: <code>###px</code> You cannot multiply it, so use <code>parseInt()</code> in your <code>Math.sin()</code> call.</li> <li>Same goes for your code to grab <code>ynow</code>, it needs <code>parseInt()</code>.</li> <li>Better is to use other (global) variables to store the x and y coordinates as numbers. And add <code>px</code> when you update coordinates of the div-element.</li> <li>When you multiply <code>2*Math.PI</code> with <code>xnow</code> (which contains only integer numbers), the <code>sin()</code> function will always return <code>0</code>. So you won't get a sine-like movement. You need to divide <code>xnow</code> by the number of x-steps you want to use to do a complete sine-like movement</li> <li><code>Math.sin()</code> returns a value between -1 and +1, so you need to multiply it by an amplitude to see a (more clear) effect.</li> </ul> <p>To keep it as much as you designed it, it would become something like this (takes 50 x-movement steps to do a complete sine and uses an amplitude of 10 pixels):</p> <pre><code>function animate() { xnow = parseInt(item.style.left); item.style.left = (xnow+1)+'px'; ynow = parseInt(item.style.top); item.style.top = (ynow+Math.sin(2*Math.PI*(xnow/50))*10) + "px"; setTimeout(animate,20); } </code></pre> <p>As mentioned: it is much better to use some global variables containing the values (instead of using <code>parseInt()</code> all the time)</p> <p>See my <a href="http://jsfiddle.net/twNcy/5/" rel="nofollow">updated JSFiddle example</a>.</p>
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    1. POShouldn't this javascript animation produce a sine wave movement?
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    1. POShouldn't this javascript animation produce a sine wave movement?
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    1. CONot sure if I understand your last point. Do you mean something like this?: `(Math.sin(2*Math.PI*(xnow/parseInt(document.body.clientWidth)))*document.height`
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