$('document').ready(function(){    

    $('#complaint_button').addClass('buttonSelected');
    $('#homepage_content_info').html($('#complaint').html());
   
    $('#complaint_button').click(function(){
        $('#homepage_content_info').html($('#complaint').html());
        $('#complaint_button').addClass('buttonSelected');
        $('#about_button').removeClass('buttonSelected');
        $('#publication_button').removeClass('buttonSelected');
    });

    $('#about_button').click(function(){
        $('#homepage_content_info').html($('#aboutus').html());
        $('#complaint_button').removeClass('buttonSelected');
        $('#about_button').addClass('buttonSelected');
        $('#publication_button').removeClass('buttonSelected');
    });

    $('#publication_button').click(function(){
        $('#homepage_content_info').html($('#publications').html());
        $('#complaint_button').removeClass('buttonSelected');
        $('#about_button').removeClass('buttonSelected');
        $('#publication_button').addClass('buttonSelected');
    });
});