Check box below, then click on the area of the drawing you want to know about, for info on that part.    What is it?  What does it do?  Details.  Text and/or images in this area will update automatically (using dynamic HTML and javascript), depending on which box above is checked and which area of the drawing the mouse is over.  Detailed info will include:  How to make the part, or Where to get it, How much it costs, Photos and/or drawings. Installation, Maintenance, Availability of consulting help, Availability of parts, kits, components, and etc. And speaking of javascript, have the mapped area change color or something on onmouseover so the end user knows what they are hitting on.