Auto-sum form

I am using this [URL=”http://javascript.internet.com/forms/auto-sum-form-boxes.html”]auto-sum form[/URL] on a page where i want registers to select drop down boxes of the quantity of items they want. i then populate the dollar value field with a specified value, and want the total field to update automatically … but doesn’t unless a keystroke or click inside the form fields occurs.

if that made any sense, anyone have any ideas how to get this to automatically total/update based on option value selection instead of having to click or keystroke?

developing page:
[url]http://www.firstofallon.com/golf-registration-test.php[/url]

thanks.

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