// Begin Rotating Image
	var banner;
	var how_many_ads = 4;
	var now = new Date()
	var sec = now.getSeconds()
	var ad = sec % how_many_ads;
	ad +=1;
	if (ad==1) {
	txt="Photo of Light Emitting Diodes (LED's)";
	alt="Photo of Light Emitting Diodes (LED's)";
	banner="graphics/photos/Mte046c.jpg";
	width="240";
	height="160";
	}
	if (ad==2) {
	txt="Photo of optical fiber with color films in the background";
	alt="Photo of optical fiber with color films in the background";
	banner="graphics/photos/29155.jpg";
	width="240";
	height="158";
	}
	if (ad==3) {
	txt="Photo of colored lights";
	alt="Photo of colored lights";
	banner="graphics/photos/4036.jpg";
	width="240";
	height="158";
	}
	if (ad==4) {
	txt="Photo of microchip and chip wafers";
	alt="Photo of microchip and chip wafers";
	banner="graphics/photos/chip.jpg";
	width="240";
	height="158";
	}
	document.write('<center>');
	document.write('<img src=\"' + banner + '\" width=');
	document.write(width + ' height=' + height + ' ');
	document.write('alt=\"' + alt + '\" border=0 hspace="0" vspace="0"><br>');
	document.write('<font face="Arial, Helvetica, sans-serif" size="-2">' + txt + '</font></a>');
	document.write('</center>');

// End -->