Self Populating Text Field, Event Handler Troubleshooting? Options

[bdpatter1]

Hi,
Fairly new to HTML and am in the process of developing a site that is integrated with Paypal. The link to the test page is below:

http://www.simonplanken.com/test.htm

Everything works on the page as I would like except I have been unable to setup a field in which the customer sees the price of the item before clicking the "add to cart" button. The way I have it setup is the price is modified depending on the dropdown menu...which works, its just the you have to add to cart to see the price. I'm sure there is a way with some sort of dynamic dropdown menu setup, but the prices don't conveniently lend themselves to that sort of setup. I'm so close to what I want! An example of what I want can be seen at:

http://www.onlineconversion.com/length_common.htm

The feature of interest being the way the answer self poulates immediately upon the user making a change in the menus (mine would be dropdown of course)

I tried some code with the onChange command (which from what I understand is the effect I want), but wasn't able to get it to work...I tried something with class="nbor" as well for the display field...I left that in for reference to what I tried, but nulled it as it gave me errors. As you can tell I am new to this and have trial and error'd my way to this point.

Anything will help!

Thanks,
BP