if (document.images) {

	  image1on = new Image();
	  image1on.src = "images/blue_line.gif";

	  image2on = new Image();
	  image2on.src = "images/blue_line.gif";

	  image3on = new Image();
	  image3on.src = "images/blue_line.gif";

	  image4on = new Image();
	  image4on.src = "images/blue_line.gif";

	  image5on = new Image();
	  image5on.src = "images/blue_line.gif";

	  image6on = new Image();
	  image6on.src = "images/blue_line.gif";

	  image7on = new Image();
	  image7on.src = "images/blue_line.gif";

	  image8on = new Image();
	  image8on.src = "images/blue_line.gif";

	  image9on = new Image();
	  image9on.src = "images/blue_line.gif";


	  image1off = new Image();
	  image1off.src = "images/blue_line_blank.gif";

	  image2off = new Image();
	  image2off.src = "images/blue_line_blank.gif";

	  image3off = new Image();
	  image3off.src = "images/blue_line_blank.gif";

	  image4off = new Image();
	  image4off.src = "images/blue_line_blank.gif";

	  image5off = new Image();
	  image5off.src = "images/blue_line_blank.gif";

	  image6off = new Image();
	  image6off.src = "images/blue_line_blank.gif";

	  image7off = new Image();
	  image7off.src = "images/blue_line_blank.gif";

	  image8off = new Image();
	  image8off.src = "images/blue_line_blank.gif";

	  image9off = new Image();
	  image9off.src = "images/blue_line_blank.gif";

	}
	
	function turnOn(imageName) {
	  if (document.images) {
	    document[imageName].src = eval(imageName + "on.src");
	  }
	}
	
	function turnOff(imageName) {
	  if (document.images) {
	    document[imageName].src = eval(imageName + "off.src");
	  }
	}