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    <p><strong>I agree with @Jason Dean,</strong> <em>But If you want to detect it by using JavaScript I would do like so: When getting the thumbnail I would attach some kind of id/class property to it and check if it's present.</em></p> <p>Check if id of "img-tumb" exists:</p> <pre><code>var imgThumb = document.getElementById("img-thumb"); if (imgThumb != null){ alert("Thumbnail exists"); }else{ //Check Image size... </code></pre> <p>Now to check the image size:(Placed after else of last if)</p> <pre><code>var img = document.getElementById('your_image_id'); var height = img.clientHeight; var width = img.clientWidth; </code></pre> <p>To change the height after the image height was detected:</p> <pre><code>img.style.height = height-50;//Substracks 50 pixles from the original size img.style.width = width-50;//Substracks 50 pixles from the original size </code></pre> <p>For you finale event(when none are detected), I would use the same checking as in phase one.</p> <p><strong>Complete code:</strong></p> <pre><code> var imgThumb = document.getElementById("img-thumb"); var imgFull = document.getElementById("img-full");//Full sized image if (imgThumb != null){ alert("Thumbnail exists"); }else if(imgFull != null){ //Check Image size... alert("Full sized image exists"); var img = document.getElementById('your_image_id'); var height = img.clientHeight; var width = img.clientWidth; img.style.height = height-50;//Substracks 50 pixles from the original size img.style.width = width-50;//Substracks 50 pixles from the original size }else{ //Place noimage.gif } </code></pre>
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    1. POChecking for existence of thumbnails and images
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    1. USfunerr
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    1. COYou're checking whether the DOM element exists, which is in no way the same thing as checking whether the actual image exists.
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    2. COIf he wants to find if the image is on the server then He cannot use Js. On the other hand, If he gets some kind of output from the server side with the img tag, then this is what he will try to use.
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