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copied!<pre><code>oImg.setAttribute('width', '1px'); </code></pre> <p><code>px</code> is for CSS only. Use either:</p> <pre><code>oImg.width = '1'; </code></pre> <p>to set a width through HTML, or:</p> <pre><code>oImg.style.width = '1px'; </code></pre> <p>to set it through CSS.</p> <p>Note that old versions of IE don't create a proper image with <code>document.createElement()</code>, and old versions of KHTML don't create a proper DOM Node with <code>new Image()</code>, so if you want to be fully backwards compatible use something like:</p> <pre><code>// IEWIN boolean previously sniffed through eg. conditional comments function img_create(src, alt, title) { var img = IEWIN ? new Image() : document.createElement('img'); img.src = src; if ( alt != null ) img.alt = alt; if ( title != null ) img.title = title; return img; } </code></pre> <p>Also be slightly wary of <code>document.body.appendChild</code> if the script may execute as the page is in the middle of loading. You can end up with the image in an unexpected place, or a weird JavaScript error on IE. If you need to be able to add it at load-time (but after the <code><body></code> element has started), you could try inserting it at the start of the body using <code>body.insertBefore(body.firstChild)</code>.</p> <p>To do this invisibly but still have the image actually load in all browsers, you could insert an absolutely-positioned-off-the-page <code><div></code> as the body's first child and put any tracking/preload images you don't want to be visible in there.</p>

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