JavaScript in forms (NEED HELP!)

I am working on a form which is located at 
http://206.98.139.182/chamber/update.shtml

I have written javascript that, when a user enters data in a particular 
field, it automatically enters a value in a second field.

I want to accomplish the same thing with a drop-down menu but I can't 
figure out how.

Using my form to illustrate my point, I want the input box to the right of 
the pull-down menus in Item #4 to automatically enter $85 if the user 
chooses BOLD, $185 if the user chooses BOLD/RED and, of course, nothing if 
the user does not choose a selection.

My other dilemna is doing a calculation.  As is obvious from my form, I 
also need the input box to the right of TOTAL to tally all the numeric 
fields above it.

I am a javascript beginner and perhaps have bitten off more than I can 
chew.  Anyone willing to help?

Thanks in advance,

Danny Griffin
Tillman, Allen, Greer

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