Justin - TestSelectOne

function test(foo) {
    try {
		return selectOne('Choose', ["a", "b", "c"], null, 0);
    } catch (e) {
       if (foo)
            return null;
        else
            throw e;
    }
}
var bar = true;
var data_file = test(bar);
log("when " + bar + " , return  = " + data_file);