User Must Have Selection for input or dropdown

Question

The idea here is that the user can only have one selection for an input text box with an id of itemURL or have a selection made for the contentPageID. If the user starts typing a response into the itemURL it makes the contentPageID dropdown back to 0 for the value which is the - Select - for the text option. If the user then changes their mind and starts to make a selection with the dropdown then it clears out the value of the itemURL text field. I've used the following code however I'm using niceforms and it has to be maniupulated a little more and not sure how.

$('contentPageID, itemURL').change ( function () { 
if ( $(this).is ('select') ) {
    $('itemURL').val ("");
}
else {
    $('contentPageID').val (0);
}
} );

I do have a reset function that uses this to clear a dropdown but not sure how to work it into what I want to do.

$('select').each(function(){
                        var option = $('option:selected', this).html();
                        var niceselect = $(this).parents('dd').find('.NFSelectRight');
                        niceselect.html(option);
                        $(this).parents('dd')
                        .find('.NFSelectTarget a')
                        .removeClass('NFOptionActive')
                        .filter(':first').addClass('NFOptionActive');
                    }); 

Answer 1

I'm using niceforms and it has to be maniupulated a little more and not sure how.

my earlier code:

function updateNiceformSelect() {

    $('select.NFhidden').each(function(){
        var option = $('option:selected', this).html();
        var niceselect = $(this).parents('dd').find('.NFSelectRight');
        niceselect.html(option);

        $(this).parents('dd')
            .find('.NFSelectTarget a')
            .removeClass('NFOptionActive')
            .each(function(){
                if($(this).html() == option)
                    $(this).addClass('NFOptionActive');
            });
    });
};

It updates niceforms select to the value of underlying html select.

http://jsfiddle.net/Jacek_FH/EwpXp/14/

Niceform uses native inputs so they do not need to be handled separately

/edit

whole working code: http://jsfiddle.net/Jacek_FH/YvGDH/5/

It was harder that I thought