DropDown values based on other selection

[limepickle]

I am wondering if the following is possible in javascript. Well I'm sure it is, but I'm a little stuck on the correct way to do it.

I have a dropdown to select a number of people from 1-6.

Underneath it I have another dropdown that selects another number 1-6, however I do not want this dropdown to exceed the previous one, ie if I select 3 people with the top one, I only want to have a max of 3 options in the dropdown below.

I know I'll have to set it using the onChange event, when the user changes the top dropdown, but can someone explain how I could set the max values of the dropdown below to suit? any pointers would be helpful here.

Thank you

[limepickle]

(shameless bump)

[SpaceFrog]

check this other topic, I think you are talking about the same thing ...

http://www.sitepoint.com/forums/showthread.php?t=460378