Multiple Dropdown - Selecting Value

Multiple Dropdown - Selecting Value

Hi,

I am very new to jquery.I am trying to implement below logic for multiple dropdown.

1) If user has selected multiple values and then "NoValue" option is selected, deselect all the options except for "NoValue" option.
2) If  "NoValue" is first option selected and then user selects other option , deselect the "NoValue" option alone.

Basically user must not be allowed to select the "NoValue" option and other options at the same time.

<select id="multiple" multiple="multiple">
    <option value="NoValue">NoValue</option>
    <option value="Bob">Bob</option>
    <option value="Christian">Christian</option>
    <option value="Daniel">Daniel</option>
</select>




Any help is highly appreciated.

Thanks!