//thanh added
function FowardColumn( type ){
    var box_id = document.getElementById("box_id");
    // back
    if (box_id.value<=1 && type==1){
        return false;
    }
    // next
    if (box_id.value==3 && type==2){
        return false;
    }
    if( type == 1 ){
        var page = parseInt(box_id.value) - 1;
    }else{
        var page = parseInt(box_id.value) + 1;
    }
    box_id.value = page;

    var limit = 3;
    var from = limit*(page-1);

    for( k = 1; k<= 3; k++ ){
        var index = from+k;
        var hr_scroll = document.getElementById("hr_scroll"+index);
        if( hr_scroll != null ){
            // next data
            hr_scroll.style.display = '';
            // back data
            if( type == 1 ){
                var reverse = index + limit;
            }else{
                var reverse = index - limit;
            }
            var reverse = document.getElementById("hr_scroll"+reverse);
            if( reverse != null ){
                reverse.style.display = 'none';
            }
        }
    }
  }