the conditional validation cannot be used from select list to select list, it can be used to have an empty selection in a select list force a text box entry.
The sample validation i sent basically said
If the select box is empty, then make sure the text box has a value.
It cant be used to make sure a selection is made in a select list if a certain item is selected in another select list, this is not posible to do with client validation or server validation.