if (document.images) 
   { 
   tac9on = new Image(64, 45); tac9on.src = "images/arrowmeet_on.gif";  
  
   tac9off = new Image(64, 45); tac9off.src = "images/arrowmeet_off.gif";  

    } 
    function img_act(imgName) { if (document.images) { imgOn = eval(imgName + "on.src"); document [imgName].src = imgOn; } } function img_inact(imgName) { if (document.images) { imgOff = eval(imgName + "off.src"); document [imgName].src = imgOff; } }