Form placeholder coffeescript

placeholder.js.coffee

# placeholder for inputs in IE
unless Modernizr.input.placeholder
  $('[placeholder]')
  .focus ->
    input = $(@)
    if input.val() == input.attr('placeholder')
      input.val('')
      input.removeClass('placeholder')
  .blur ->
    input = $(@)
    if input.val() == '' or input.val() == input.attr('placeholder')
      input.addClass('placeholder')
      input.val(input.attr('placeholder'))
  .blur().parents('form').submit ->
    $(@).find('[placeholder]').each ->
      input = $(@)
      if input.val() == input.attr('placeholder')
        input.val('')