function simple_check(form, field_vec)
{
	var fields = field_vec.split(", ");
	var i = 0;
	for( ; i < fields.length; ++i)
	{
		if(document.eval(form).eval(fields[i]).value == "")
		{
			alert("Bitte füllen Sie alle Felder aus.");
			break;
		}
	}
	if(i == fields.length)
		return true;
	return false;
}

function extended_check(form, field, pattern, error_msg)
{
	var input = document.eval(form).eval(field).value;
	if(pattern.exec(input))
		return true;
	alert(error_msg);
	return false;
}