Why doesn't this bit of code work?

programming flash
1

As the header said, why doesn’t this work?

I want to use it as a login screen in flash to my ftp.

//This goes in frame actions
function Login(user, pass, servers) {
var cusername = user:String;
var cpassword = pass:String;
var cserver = servers:String;

     if (cusername == undefined) {
         status = "Please enter your username";
      } else {
                 if (cpassword == undefined) {
                      status = "Please enter your password";
                  } else {
                             if (cserver == undefined) {
                                  status = "Please enter the server";
                               } else {
                                         address = "ftp://"+cusername+":"+cpassword+"@"+cserver;
                                         getURL = (address, _blank);
                               username = "";
                               password = "";
                               }
                   }
         }

}

for the connect button:

on (Release) {
_root.login(username, password, server);
}