function blinkOn() 
  {
    main_navi_blink.style.color = "#555658";
    timerOne = setTimeout("blinkOff()", 1000);
  }

function blinkOff() 
  {
    main_navi_blink.style.color = "#BB2D19";
    timerTwo = setTimeout("blinkOn()", 1000);
  }