$(document).ready(function(){
	var bigzoom = {  
	   thumbsize: 400,  
	   zoomsize: 900,  
	   border: 40,
	   top: 6,
       left: 6
	};
	$("#main_image img[class] ~ span").thumbZoom(bigzoom);
	
	$("#product_images table td[class!=no_image] img").click(
	  function(){
	    $("#main_image img").attr('src', $(this).attr('src').replace('_th', '_ma'));
	    $("#main_image img").attr('class', $(this).attr('src').replace('_th', ''));
	  });
});