Start the animation of a .gif on click. This adds a "start / stop" button below your still image (abc_still.gif / class : img_anim) that will change the .gif to the animated version (abc.gif)

gistfile1.js

jQuery(".img_anim").after( function() {

  // keep ref to the image
	var image = this;

	// add div container for the link
	var $d = jQuery("<div />");

	// add link
	var $a = jQuery("<a>Start / Stop animation</a>");
	$d.append($a);

	// add click event
	$a.on("click", function() { 

		// get the src of the image
		var src = jQuery(image).attr("src");

		// change the image
		if(jQuery(src.split("_")).last()[0] == "still.gif")
			jQuery(image).attr('src', src.replace('_still.gif', '.gif'));
		else
			jQuery(image).attr('src', src.replace('.gif', '_still.gif'));
		
	})
	return $d;

});