-2
You can force the jQuery slideshow to start from a particular slide index by calling:
mcThumbnailSlider.display(index);
For example, you can add the following script into your page:
<script>
//suppose you get the slide index number from URL parameter, say slide=2, then you can call:
//how to get url parameter?
//read: http://stackoverflow.com/questions/979975/how-to-get-the-value-from-url-parameter
mcThumbnailSlider.display(2);
</script>
Note: To use the script above, the thumbnail-slider.js should be at least the version v2013.3.18.