// Netscape 3.0 compatibility test (for javascript image swapping)
compat = false;
if( parseInt( navigator.appVersion ) >= 3 ) { compat = true; }

// cache images for quick swapping
if( compat )
{
  alloff = new Image();
  alloff.src  = "pics/mainimg/mainimg.gif";

  tung2ovr  = new Image();
  tung2ovr.src   = "pics/mainimg/mainimgTungOn.gif";

  moly2ovr = new Image();
  moly2ovr.src  = "pics/mainimg/mainimgMolyOn.gif";

  tant2ovr = new Image();
  tant2ovr.src  = "pics/mainimg/mainimgTantOn.gif";

  cerm2ovr = new Image();
  cerm2ovr.src  = "pics/mainimg/mainimgCermOn.gif";

  about2ovr = new Image();
  about2ovr.src  = "pics/mainimg/mainimgAboutOn.gif";

  pinq2ovr = new Image();
  pinq2ovr.src  = "pics/mainimg/mainimgPInqOn.gif";

  cont2ovr = new Image();
  cont2ovr.src  = "pics/mainimg/mainimgContOn.gif";

  foil2ovr = new Image();
  foil2ovr.src  = "pics/mainimg/mainimgFoilOn.gif";

  sheet2ovr = new Image();
  sheet2ovr.src  = "pics/mainimg/mainimgSheetOn.gif";

  plate2ovr = new Image();
  plate2ovr.src  = "pics/mainimg/mainimgPlateOn.gif";

  rod2ovr = new Image();
  rod2ovr.src  = "pics/mainimg/mainimgRodOn.gif";

  wire2ovr = new Image();
  wire2ovr.src  = "pics/mainimg/mainimgWireOn.gif";

  screen2ovr = new Image();
  screen2ovr.src  = "pics/mainimg/mainimgScreenOn.gif";

  tube2ovr = new Image();
  tube2ovr.src  = "pics/mainimg/mainimgTubeOn.gif";

  fastn2ovr = new Image();
  fastn2ovr.src  = "pics/mainimg/mainimgFastnOn.gif";

  thrd2ovr = new Image();
  thrd2ovr.src  = "pics/mainimg/mainimgFastnThrdsOn.gif";

  screws2ovr = new Image();
  screws2ovr.src  = "pics/mainimg/mainimgFastnScrewsOn.gif";

  nuts2ovr = new Image();
  nuts2ovr.src  = "pics/mainimg/mainimgFastnNutsOn.gif";

  wshrs2ovr = new Image();
  wshrs2ovr.src  = "pics/mainimg/mainimgFastnWshrsOn.gif";

  rivets2ovr = new Image();
  rivets2ovr.src  = "pics/mainimg/mainimgFastnRivetsOn.gif";

  fab2ovr = new Image();
  fab2ovr.src  = "pics/mainimg/mainimgFabOn.gif";

  shields2ovr = new Image();
  shields2ovr.src  = "pics/mainimg/mainimgFabShldsOn.gif";

  elems2ovr = new Image();
  elems2ovr.src  = "pics/mainimg/mainimgFabElemsOn.gif";

  furn2ovr = new Image();
  furn2ovr.src  = "pics/mainimg/mainimgFabFurnRelOn.gif";

}
else
{
  alert('not compatible')
}