grep over ssh in emacs

M-x grep command is very useful in a number of situation, because, for example, it give you direct access to all matched file ...

But there is not so intuitive how to use grep when opening file via ssh, this is the trick:

First generate a key pair and upload public part to the remote server:
(suppose remote host/user is B/b)

ssh-keygen -t rsa
ssh b@B mkdir -p .ssh
cat ~/.ssh/ | ssh b@B 'cat >> .ssh/authorized_keys'

be sure to use ssh-agent in order to use ssh-add

jQuery Waiting plugin

This is a simple jQuery plugin for purpose of loading phase of an ajax request or anything else.
to stop a waiting div

move multiple option in select with jQuery

I look for this everywhere: how to move multiple option inside a select
function upfield() {
  var el = $('#selectedfield').children('[@selected]:first').prev();


function downfield() {
  var el = $('#selectedfield').children('[@selected]:last').next();
	el = $(el).next();