if (document.images) {
  		DentalUnitOn = new Image();
  		DentalUnitOn.src = "default_files/menuDentalUnitOn.gif";
  		SterilisationOn = new Image();
  		SterilisationOn.src = "default_files/menuSterilisationOn.gif";
  		AlginateMixerOn = new Image();
  		AlginateMixerOn.src = "default_files/menuAlginateMixerOn.gif";
		HandpiecesOn = new Image();
  		HandpiecesOn.src = "default_files/menuHandpiecesOn.gif";
  		CuringLightsOn = new Image();
  		CuringLightsOn.src = "default_files/menuCuringLightsOn.gif";
  		XraysAndCamerasOn = new Image();
  		XraysAndCamerasOn.src = "default_files/menuXraysOn.gif";
  		CompressorsOn = new Image();
  		CompressorsOn.src = "default_files/menuCompressorsOn.gif";
  		OtherOn = new Image();
  		OtherOn.src = "default_files/menuOtherproductsOn.gif";
  		SuctionMotorOn = new Image();
  		SuctionMotorOn.src = "default_files/menuSuctionMotorOn.gif";  		  		
		DentalUnitOff = new Image();
  		DentalUnitOff.src = "default_files/menuDentalUnit.gif";
 		SterilisationOff = new Image();
  		SterilisationOff.src = "default_files/menuSterilisation.gif";
  		AlginateMixerOff = new Image();
  		AlginateMixerOff.src = "default_files/menuAlginateMixer.gif";
		HandpiecesOff = new Image();
  		HandpiecesOff.src = "default_files/menuHandpieces.gif";
  		CuringLightsOff = new Image();
  		CuringLightsOff.src = "default_files/menuCuringLights.gif";
  		XraysAndCamerasOff = new Image();
  		XraysAndCamerasOff.src = "default_files/menuXrays.gif";
  		CompressorsOff = new Image();
  		CompressorsOff.src = "default_files/menuCompressors.gif";
		OtherOff = new Image();
  		OtherOff.src = "default_files/menuOtherProducts.gif";
  		SuctionMotorOff = new Image();
  		SuctionMotorOff.src = "default_files/menuSuctionMotor.gif";  
  	}

	function changeImages() {
  		if (document.images) {
   			for (var i=0; i<changeImages.arguments.length; i+=2) {
      			document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    			}
  			}
		}