document.write("    <A HREF=" + dir_depth + "../sdprop/index.htm><FONT COLOR=BLACK>Non-conv. Propulsion</FONT></A><BR>")
document.write("    <A HREF=" + dir_depth + "../equip/index.htm><FONT COLOR=BLACK>Equipment</FONT></A><BR>")
document.write("    <A HREF=" + dir_depth + "../materials/index.htm><FONT COLOR=BLACK>Materials</FONT></A><BR>")
document.write("    <A HREF=" + dir_depth + "../stories/index.htm><FONT COLOR=BLACK>Stories</FONT></A><BR>")