function toggle_stats(cell){
        var c = cell.className;
        if(!c) return;
        var stat = document.getElementById('stat_paragraph');
        if(c == "about_cell_down"){
            cell.className = "about_cell_up";
            if(stat) stat.style.display = 'block';
        } else if( c== "about_cell_up"){
            cell.className = "about_cell_down";
            if(stat) stat.style.display = 'none';
        }
    }