Accessing a form variable before the form is posted

My function for generating a select menu for a city sets the select name to form[city_id]. In one of the forms, there is a selection for City in the address details as well as one for the port of destination. If I use the function both the the select name will be form[city_id]. The port of destination selection overwrites the form[city_id] from the selection of City. Is there a way to access the first form[city_id] for assigning to another variable? In short is it possible to access a variable from the form before the form is posted? Best regards, Siva, -- Ma Siva Kumar BSG LeatherLink, Tamil Nadu, India - 600040 Email: siva@leatherlink.net Website: http://www.leatherlink.net/