change default value of drop down list in new item form of WSS 3

I want to set the default value of a drop down list is equal to another filed in the same form.
For example, when load the form,  the default value of Event Category is equal to the default value of Conference Room.
 And if i click the Conference Room drop down list to other option, let's say, from Conference Room 1 to Conference Room 2, the value of Event Catalog will be update to Conference Room 2.
Any idea how can i do it?
Thank you.

Default-Value.jpg
dickchanAsked:
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dp_expertConnect With a Mentor Commented:
Your only option is to edit this page using SharePoint  Designer. Simply add a JavaScript code that will change the selection of this field and you are done.

To learn more about how to find a specific field with JS - http://www.experts-exchange.com/Q_24546806.html
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