if (document.images) {
homeoff=new Image();
homeoff.src= "/images/menu/homeoff.png";
homeon=new Image();
homeon.src= "/images/menu/homeon.png";
aboutoff=new Image();
aboutoff.src= "/images/menu/aboutoff.png";
abouton=new Image();
abouton.src= "/images/menu/abouton.png";
downloadoff=new Image();
downloadoff.src= "/images/menu/downloadoff.png";
downloadon=new Image();
downloadon.src= "/images/menu/downloadon.png";
purchaseoff=new Image();
purchaseoff.src= "/images/menu/purchaseoff.png";
purchaseon=new Image();
purchaseon.src= "/images/menu/purchaseon.png";
supportoff=new Image();
supportoff.src= "/images/menu/supportoff.png";
supporton=new Image();
supporton.src= "/images/menu/supporton.png";
forumoff=new Image();
forumoff.src= "/images/menu/forumoff.png";
forumon=new Image();
forumon.src= "/images/menu/forumon.png";
contactoff=new Image();
contactoff.src= "/images/menu/contactoff.png";
contacton=new Image();
contacton.src= "/images/menu/contacton.png";
}


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

function check_email(address) {
  if ((address == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}