$(document).ready(function() {
	// click handler for the thumbs
	$(".thumbs a").click(function(event)
	{
		// prevent the browser doing it's default thing
		event.preventDefault();
		// store the image name in a variable
		var thumb_src = $(this).attr("href");
		// set the big image href to the href of the thumbnail	
		$(".gallery img.main-image").attr("src", thumb_src);
	});
});