$(function() {
  $("#email-signup form").submit(function(e) {
    e.preventDefault();
  
    if (valid_email($("#email").val()))
    {
      $("#email-signup").animate({'opacity':"0.2"}, 500, function() { 
          $(this).animate({'opacity':"1.0"}, 500) 
      });
    
      $.post($(this).attr("action"), $(this).serialize(), function(response) {        
        if (response.success) {
            $("#email").val('enter your email');
          
            $("#email-signup").append('<span class="flash success">Thanks!</span>');                    
        } else {
            $("#email-signup").append('<span class="flash error">Whoops! There was an error.</span>');
        }
                      
        setTimeout(function() {
            $("#email-signup span.flash").fadeOut("slow").remove();
        }, 5000);
      }, "json");
    }
  });
});

function valid_email(str) {
  return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}