if (document.images) {
		image1on = new Image();
		image1on.src="header_images/header_05_Select.gif";
		image1off =new Image();
		image1off.src="header_images/header_05.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");
	  }
	}