function SwitchImages(NewImage, ImageName)
 {document[ImageName].src=NewImage.src
  }

 {Home_On = new Image()
  Home_On.src ="IMAGES/home_on.gif"
  Home_Off = new Image()
  Home_Off.src ="IMAGES/home_off.gif"
  
  Tabs_On = new Image()
  Tabs_On.src ="IMAGES/tabs_on.gif"
  Tabs_Off = new Image()
  Tabs_Off.src ="IMAGES/tabs_off.gif"
  }