function validate() {
	if (document.form1.username){
		var f = document.form1.username;
		var emailexp = /^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i;
		if (f.value == ""){
			alert("Please enter your username, which is your member email address.");
			f.focus();
			return false;
		} else if (!isValid(emailexp,document.form1.username.value)) {
			alert("Your email address is not in the correct format.");
			f.focus();
			return false;
		} 
	}
	if (document.form1.password){
		var f = document.form1.password;
		if (f.value == ""){
			alert("Please enter your password.");
			f.focus();
			return false;
		} 
	}
}