Well, I need the radio buttons to display the list of all the departments 
in the company. Reason why I use radio button is that, in every 
department, I need to show some additional informations like telephone, 
address, and so forth. The form for these radio buttons is shown in a pop-
up window. User picks the department they desire. Also the user don't 
want the screen to be splitted. Well, I guess I'll try to use link 
instead and pass the parameter to the main form.


> 
From a usability perspective, I'd want to know what type of user would 
want to choose from 1500 options in one go. How about splitting it into 
two screens, so the user narrows down the options using the first screen, 
then gives hisher exact answer in the second.

Secondly, how about trying some different control types - e.g. if it's a 
numeric value, why not let the user enter it freely; if it's a text 
choice, how about select boxes or anchor links? What are you trying to 
achieve?

Hope this helps
ian