function validate() {
	if (document.forms[0].username){
		var f = document.forms[0].username;
		if (f.value == ""){
			alert("You must enter your username.");
			f.focus();
			return false;
		} 
	}
	if (document.forms[0].password){
		var l = document.forms[0].password;
		if (l.value == ""){
			alert("You must enter a password.");
			l.focus();
			return false;
		}
	} 
}