if (document.images) {
homeoff=new Image();
homeoff.src= "images/homeoff.gif";
homeon=new Image();
homeon.src= "images/homeon.gif";
contactoff=new Image();
contactoff.src= "images/contactoff.gif";
contacton=new Image();
contacton.src= "images/contacton.gif";
aboutoff=new Image();
aboutoff.src= "images/aboutoff.gif";
abouton=new Image();
abouton.src= "images/abouton.gif";

copperoff=new Image();
copperoff.src= "images/copperoff.gif";
copperon=new Image();
copperon.src= "images/copperon.gif";
electrolessoff=new Image();
electrolessoff.src= "images/electrolessoff.gif";
electrolesson=new Image();
electrolesson.src= "images/electrolesson.gif";
goldoff=new Image();
goldoff.src= "images/goldoff.gif";
goldon=new Image();
goldon.src= "images/goldon.gif";
nickeloff=new Image();
nickeloff.src= "images/nickeloff.gif";
nickelon=new Image();
nickelon.src= "images/nickelon.gif";
palladiumoff=new Image();
palladiumoff.src= "images/palladiumoff.gif";
palladiumon=new Image();
palladiumon.src= "images/palladiumon.gif";
platinumoff=new Image();
platinumoff.src= "images/platinumoff.gif";
platinumon=new Image();
platinumon.src= "images/platinumon.gif";
rhodiumoff=new Image();
rhodiumoff.src= "images/rhodiumoff.gif";
rhodiumon=new Image();
rhodiumon.src= "images/rhodiumon.gif";
waferoff=new Image();
waferoff.src= "images/waferoff.gif";
waferon=new Image();
waferon.src= "images/waferon.gif";

}

function imageOn (imagename){
  document[imagename].src=eval(imagename+"on.src");
 }
function imageOff (imagename){
  document[imagename].src=eval(imagename+"off.src");
 }