How to create a cascade dropdown menu in a sharepoint list

I have a deparment's list and a category's list.
I have a look up field for the department that gets all of the departments in the department's list.
I would like to have a choice field that will get populated according to the department.

departments list looks like:
Department
IS
HR
Sales
....etc

Categories list looks like:
Department                    Category
IS                                   Network Issue
IS                                   Datawarehouse
HR                                 New Hire
HR                                 Benefits
.....etc
Can this be acomplished using content types?
I appreciate your input or any suggestions you might have.
Thanks
Arnie
arnulfoespiAsked:
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neilrichardsCommented:
Not OOTB.  You will have to write some javascript, write some c#, download something from codeplex or purchase something.

I would look at the codeplex approach

http://www.codeplex.com/CustomFieldControls

or writing c#
http://datacogs.com/datablogs/archive/2007/08/26/641.aspx

The javascript approach is pretty nasty and I would advise against it.  

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arnulfoespiAuthor Commented:
This soulution works like a charm!
http://datacogs.com/datablogs/archive/2007/08/26/641.aspx
Exactly what I was looking for.
Thanks for the input.
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