using Time Picker

using Time Picker

I want to use TimeRange feature of this plugin

http://keith-wood.name/timeEntry.html

I am able to use this in simple form, but i am not able to do Time Range feature
 
 Please help
My code is below for TimeRange

 $('.timeRange').timeEntry({ beforeShow: customRange });

    function customRange(input) {
        return { minTime: (input.id == 'timeTo' ?
        $('#timeFrom').timeEntry('getTime') : null),
            maxTime: (input.id == 'timeFrom' ?
        $('#timeTo').timeEntry('getTime') : null)
        };
    }

 <input size="10" class="timeRange" id="timeFrom" type="text" /> to
 <input size="10" class="timeRange"  id="timeTo" type="text" />