Let's say I've text_field_tag A and B.
I type something in A and hit the tabulator-key. An observe_field- helper-method gets triggered, some fancy Ajax-JS-stuff happens, the formerly disabled field B gets enabled and now I'm able to type into textfield B.
No, how can I say with JS/Prototype/Railshelpers that I'd like the cursor to jump right in textfield B after the Ajax-JS-stuff happend? So the user can just write along after hitting the tab-key and changing from A to B?