Add Placeholder text to wordpress login forms

gistfile1.txt

// JavaScript Document

jQuery(function ($) {
	/* You can safely use $ in this code block to reference jQuery */


$(document).ready(function(){
  $('form').find('input[name="log"]').each(function(ev)
  {
      if(!$(this).val()) {
     $(this).attr("placeholder", "Username");
  }
  });
});

$(document).ready(function(){
  $('form').find('input[name="pwd"]').each(function(ev)
  {
      if(!$(this).val()) {
     $(this).attr("placeholder", "Password");
  }
  });
});
   /* You can safely use $ in this code block to reference jQuery */
});

What about localize support? I think you have to use wp_localize_script