function changeOption (productId, sku, smallImage, largeImage){
	if(largeImage.length > 0)
	{
		var img = new Image();
		img.onload = function()
		{
			Eset('mainImage'+productId, 'src', largeImage);
			$('mainImageLink'+productId).href = largeImage;
			Shadowbox.setup( $('mainImageLink'+productId), { handleOversize: "drag", displayNav:false } );
		}		
		img.src = largeImage;
	}
}