var tr_selected = '';

    function selectRadio(row_num){
        unSelectAll();
        if (document.radioForm.row_radio.length != undefined){
            document.radioForm.row_radio[row_num - 1].checked = true;
        }
        else{
            document.radioForm.row_radio.checked = true;
        }

        if (tr_selected != '')
            document.getElementById('tr_' + tr_selected).className = 'form_var';

        document.getElementById('tr_' + row_num).className = 'form_var_hover';
        tr_selected = row_num;
    }

    function unSelectAll(){
        if (document.radioForm.row_radio.length != undefined){
            for (var i=0; i < document.radioForm.row_radio.length; i++){
                document.radioForm.row_radio[i].checked = false;
            }
        }
    }

    function hover(obj){
        obj.className='form_var_hover';
    }

    function unHover(obj, row_num){
        if (tr_selected != row_num) obj.className = 'form_var';
    }