how to change a value of one combobox onchange of value of another combobox?

[nisha chaudhary]

i am using a jsp page and trying to change the value of one combobox onchange in value of another. the value should be retrieved from a database.how i can do this using ajax in jsp page

[Dormilich]

as gits already mentioned, JSP has nothing to do with JavaScript.

[nisha chaudhary]

how we can change value of one combobox onchange in another combobox using javascript