Insert url automatically

Hi,

My form has the following fields

Month                             (Dropdown Choice)

Results 2009                  URL
                                       Link Name

Depending on the Month value I need to insert the URL with Link Name

EG

Month = January

Therefore

if (input.Month == "January")

           input.Results_2009 == URL

           and Link Name = Results.

Field "Results 2009"does not appear in script Field Actions

Thanks