var torg_p=1;

function torg_cell(inc)

  {
    torg_p+=inc;
    /*
    torg_p+=inc;

    if(torg_p<1) torg_p++;

    if(!document.getElementById('trgcl_m'+(torg_p+1))) torg_p--;

    var tlc_on=document.getElementById('trg_left_ctrl_on');

    var tlc_off=document.getElementById('trg_left_ctrl_off');

    var trc_on=document.getElementById('trg_right_ctrl_on');

    var trc_off=document.getElementById('trg_right_ctrl_off');



    if(!document.getElementById('trgcl_m'+(torg_p-1))) {tlc_on.className="off"; tlc_off.className="";}

    else {tlc_on.className=""; tlc_off.className="off";}

    if(!document.getElementById('trgcl_m'+(torg_p+2))) {trc_on.className="off"; trc_off.className="";}

    else {trc_on.className=""; trc_off.className="off";}
    */
    
    /*for(var i=1;;i++)

    {

    var o_m=document.getElementById('trgcl_m'+i);

      //var o_m=document.getElementById('trgcl_m'+i);

      //var o_b=document.getElementById('trgcl_b'+i);

      if(!o_m) break;
      
      if(i>=torg_p && i<=torg_p+1) {o_m.className="c";}

      else {o_m.className="c off";}

    }*/
    var tlc_on=document.getElementById('trg_left_ctrl_on');

    var tlc_off=document.getElementById('trg_left_ctrl_off');

    var trc_on=document.getElementById('trg_right_ctrl_on');

    var trc_off=document.getElementById('trg_right_ctrl_off');

    document.getElementById('trgcl_m'+torg_p).className = "c";
    
    if(torg_p == 1) {
      document.getElementById('trgcl_m2').className = "off";  
      trc_on.className="on"; trc_off.className="off";      
      tlc_on.className="off"; tlc_off.className="";
    } else {
      tlc_on.className = "on"; tlc_off.className="off";
      trc_on.className="off"; trc_off.className="";
      document.getElementById('trgcl_m1').className = "off";  
    }
    
    return false;

  }