ok, it makes a little more sense now...

I'm afraid I am working on linux here and only using mozilla, so any code I post will only be checked on Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050110 Firefox/1.0 (Debian package 1.0+dfsg.1-2)

a couple pointers, if your checking for updates now:
[1] You need to set the value of the hidden fields in the txtChange function, you cannot assign them inline like this, a textfield will not update itself like this.
[2] I like you anonymous function, but it won't understand what the other arguments are when it gets called. It understands 'this', because it is called by a dom object that can be referred to that way.. it doesn't understand pname etc because those variables are out of scope.

... there will be more later.
alpha_foobar