In my SEARCH page, user was given 5 types of field(drop-down menu) to choose from. User can select either 1, 2,3,4 or all the field's option to make a search. I know how to do validation field by field(need to fill in the previous field before use can proceed to the next field), but I don't know how to write a JSript to alert " None of the field chosen! " and if at least ONE of the field is chosen, then the user can submit his/her search. Please advise.