var  valid = null;

function init(){
    Event.observe('subscribe_form', 'submit', subscribe, false);
    valid = new Validation('subscribe_form',{onSubmit:false});
}

function subscribe(){

	$('message').update('');
	
    var result = valid.validate();
    	
    if (result) {
    
    	var url = 'subscribe.php';
        var pars = 'email_address='+escape($F('email_address'));
    	var target = 'message';
    	var myAjax = new Ajax.Updater(target, url, {method: 'post', parameters: pars});
    		
    }
    
    
}

Event.observe(window, 'load', init, false);