// JavaScript Document
function validate(form) {
  if(form.elements['username'].value == '') {
	alert('You must enter your username.');
	form.elements['username'].focus();
	return false;
  }
  if(form.elements['password'].value == '') {
	alert('You must enter your password.');
	form.elements['password'].focus();
	return false;
  }
  return true;
}