window.addEvent('domready', function(){ 
    $('header_email').addEvent('click',function(e) {
        if (this.get('value')=="enter email address") {
            this.set('value','');
        }
    });
    $('header_signup').addEvent('submit',function(e){
        var ev=new Event(e).stop();
        if (($('header_email').get('value')!="") && ($('header_email').get('value')!="enter email address")) { 
            this.set('send', { onComplete: function(response) {
                if (response=="Subscribed, thank you") {
                    $('formContents').set('html','<p>'+response+'</p>');
                } else {
                    $('headerEmailError').set('text',response); 
                }
            }});
            this.send();
        }
   });
});