.product_img_link img.front-image, .product_image img.front-image{
	left: 0;
}
.product_img_link img.back-image, .product_image img.back-image{
	left: 100%;
	top: 0;
}
.pro_first_box.showhoverimage img.back-image{
    left: 0;
}
.pro_first_box.showhoverimage img.front-image{
    left: -100%;
}