HTML form

[alev]

Hi
I need some one to help me with my little problem
I have a payment form Pay field has dropdown OPTION amount list.
Here what I need to all the amounts can be in the list so I create input field that will allow user input amount by heand nf using check box JavaScript I hide this field so if box is checked input field is visible, but so as dropdown one.
So what I need is help with check box hidin one field ( dropdown) and unhiode input field.
I hope some one know how to do this


Thanx