$(document).ready(function(){
   $('.inputfield').each(function(){
       $(this).val('');
       add_placeholder($(this));
   })

   $('.inputfield').focus(function(){
       remove_placeholder($(this));
   }).blur(function(){
       add_placeholder($(this));
   }).blur();

   $('#form').submit(function(){
      $('.inputfield').each(function(){
          remove_placeholder($(this));
      });
      return checkFields(".required", "#email");
   });
});

function add_placeholder(field)
{
   var placeholder = field.attr('name');
   if(field.val() == '')
   {
        field.val(placeholder);
        field.addClass('placeholder');
   }
}

function remove_placeholder(field)
{
   var placeholder = field.attr('name');
   if(field.val() == placeholder)
   {
        field.val('');
        field.removeClass('placeholder');
   }
}