function checkform(){
	if(document.ExtUserForm.Username.value.length <= 0){
		alert('Angiv brugernavn');
		document.ExtUserForm.Username.focus();
		return false;
	}

	if(document.ExtUserForm.Password.value.length <= 0){
		alert('Angiv kodeord');
		document.ExtUserForm.Password.focus();
		return false;
	}
	return true;
}