.header {
	background-image: url(images/certification.gif);
	background-repeat: no-repeat;
}
.metallurgical {
	background-image: url(images/metallurgical.gif);
	background-repeat: no-repeat;
}
.inspection {
	background-image: url(images/inspection.gif);
	background-repeat: no-repeat;
}
.welding {
	background-image: url(images/welding.gif);
	background-repeat: no-repeat;
}