#section-img_w {
    width: 50%;
	float: left;
	border: 1px solid #ff0000;
}
#section-img_h {    width: 50%;
	float: left;
	border: 1px solid #ff0000;
}

#section-img_w .explain {
       width: 30px;	float: left;	border: 1px solid #ff0000;
}
#section-img_w .controls {
    width: 70px;	float: left;
	border: 1px solid #ddd;
}

#section-img_h .controls{
    width: 50%;
	border: 1px solid #ff0000;
}