deselect others in mutiple selection list.. 2

[kuolung]

I have this scenerio. I have a multiple selection list of Countries, however, when US (country_id = 1) is selected, I want to deselect all other countries. In other words, EITHER you select US only OR you select other countries (but US). Does anyone has a javascript that can do such thing or any advices on the solution? Thanks.

 

[cLFlaVA]

something like:

var theSel = document.forms['formName'].elements['selectName'];
var opts = theSel.options;

// if the very first option is selected...
if (opts[0].selected) {
    // loop through all the others
    for (var i = 1; i < opts.length; i++) {
        // and de-select them
        opts[i].selected = false;
    }
}


}

*cLFlaVA
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[kuolung]

Thanks so much.. it works well!