function rollover(imgout,imgover,imgdown){
  if(document.images){
    this.imgout=new Image;
    this.imgout.src=imgout;
    this.imgover=new Image;
    this.imgover.src=imgover;
    this.imgdown=new Image;
    this.imgdown.src=imgdown;
  }
}
function imgswap(imagename,state,layername){
  // 0 = out, 1 = over, 2 = down
  switch(state){
    case 0:document[imagename].src=eval("r_" + imagename + ".imgout.src");
      break;
    case 1:document[imagename].src=eval("r_" + imagename + ".imgover.src");
      break;
    case 2:document[imagename].src=eval("r_" + imagename + ".imgdown.src");
      break;
  }
}
r_home=new rollover("images/home.gif","images/home-over.gif","images/home-down.gif");
r_news=new rollover("images/news.gif","images/news-over.gif","images/news-down.gif");
r_equipment=new rollover("images/equipment.gif","images/equipment-over.gif","images/equipment-down.gif");
r_staff=new rollover("images/staff.gif","images/staff-over.gif","images/staff-down.gif");
r_sessiontips=new rollover("images/sessiontips.gif","images/sessiontips-over.gif","images/sessiontips-down.gif");
r_gallery=new rollover("images/gallery.gif","images/gallery-over.gif","images/gallery-down.gif");
r_articles=new rollover("images/articles.gif","images/articles-over.gif","images/articles-down.gif");
r_rates=new rollover("images/rates.gif","images/rates-over.gif","images/rates-down.gif");
r_contactus=new rollover("images/contactus.gif","images/contactus-over.gif","images/contactus-down.gif");