Javascript:Populate .net dropdown

I have a .net radiobutton list with 2 options.

If the user clicks on rad1 then bindcombo1() method is called else bindmethod2() is called. This all works fine but the client has now asked that the process avoids the round trip meaning that I will have to perform this operation in javascript.

Javscript and .net I struggle with and was wondering if you could give me a hand.

Is it possible to populate a .net sropdown with javascript and if so how ?

Thanks in Advance

On the JavaScript side, the .Net dropdown is just a set of HTML tags. It's certainly possible to populate it, but the exact manner depends on how the .Net dropdown is converted to HTML.