// preload images
   
   imagelogo = new Image();
   imagelogo.src = "/_components/_images/logo_museum.gif";
   
   imagedropA = new Image();
   imagedropA.src = "/_components/_images/dropA.gif";
   
   imagedropB = new Image();
   imagedropB.src = "/_components/_images/dropB.gif";
   
   imagedropC = new Image();
   imagedropC.src = "/_components/_images/dropC.gif";
   
   imageAf = new Image();
   imageAf.src = "/_components/_dmbA/nav1A_off.gif";

   imageAn = new Image();
   imageAn.src = "/_components/_dmbA/nav1A_on.gif";

   imageBf = new Image();
   imageBf.src = "/_components/_dmbA/nav1B_off.gif";

   imageBn = new Image();
   imageBn.src = "/_components/_dmbA/nav1B_on.gif";

   imageCf = new Image();
   imageCf.src = "/_components/_dmbA/nav1C_off.gif";

   imageCn = new Image();
   imageCn.src = "/_components/_dmbA/nav1C_on.gif";

   imageDf = new Image();
   imageDf.src = "/_components/_dmbA/nav1D_off.gif";

   imageDn = new Image();
   imageDn.src = "/_components/_dmbA/nav1D_on.gif";

   imageEf = new Image();
   imageEf.src = "/_components/_dmbA/nav1E_off.gif";

   imageEn = new Image();
   imageEn.src = "/_components/_dmbA/nav1E_on.gif";

   imageFf = new Image();
   imageFf.src = "/_components/_dmbA/nav1F_off.gif";

   imageFn = new Image();
   imageFn.src = "/_components/_dmbA/nav1F_on.gif";

   imageGf = new Image();
   imageGf.src = "/_components/_dmbA/nav1G_off.gif";

   imageGn = new Image();
   imageGn.src = "/_components/_dmbA/nav1G_on.gif";

   imageNewWindowOff = new Image();
   imageNewWindowOff.src = "/_components/_dmbA/icon_NewWindow_off.gif";

   imageNewWindowOn = new Image();
   imageNewWindowOn.src = "/_components/_dmbA/icon_NewWindow_on.gif";

   imageArrowRight = new Image();
   imageArrowRight.src = "/_components/_dmbA/arrow_Right.gif";

   imageArrowDown = new Image();
   imageArrowDown.src = "/_components/_dmbA/arrow_Down.gif";