if (document.images) {
	  imgPrinterIcoOn = new Image();
	  imgPrinterIcoOn.src = "images/printerico_on.gif";
	
	  imgEmailIcoOn = new Image();
	  imgEmailIcoOn.src = "images/emailico_on.gif";
	
	  imgPrinterIcoOff = new Image();
	  imgPrinterIcoOff.src = "images/printerico.gif";
	
	  imgEmailIcoOff = new Image();
	  imgEmailIcoOff.src = "images/emailico.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");
	  }
	}