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

    function img_inact(imgName) {
      if (document.images != null) {
        imgOff = eval(imgName + "off.src");
        document[imgName].src = imgOff;
      }
    }
    function create_image(src) {
		  rslt = new Image();
		  rslt.src = src;
		  return rslt;
	  }

    function loaded() {
      if(document.images != null) {
        // preload images

        /* for(var i=0; img_picks != null && i < img_picks.length; i++) {
          img_picks[i].image = create_image(img_picks[i].src);
        } */
      }
    }