var invalid_email_message;
function valid_list_signup(form){
	if(form.email.value.match(/^[_a-zA-Z0-9-]+[\._a-zA-Z0-9-]*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.[a-zA-Z]{2,7}$/)){
		//alert('ok');
		return(true);
	}
	else{
		if(invalid_email_message){
			alert(invalid_email_message);
		}
		else{
			alert('The e-mail address you entered does not appear to be valid. Please check your address and try again.');
		}
		return(false);
	}
}
var email_changed = false;
function enter_email(input){
	if(!email_changed){
		input.value = '';
	}
	email_changed = true;
}