function preload(imgObj,imgSrc){
  if(document.images) {
    eval(imgObj+' = new Image()');
    eval(imgObj+'.src = "'+imgSrc+'"');
  }
}

preload('home_up','http://www.confitech.com/images/nav-home-up.gif');
preload('home_over','http://www.confitech.com/images/nav-home-over.gif');
preload('solutions_up','http://www.confitech.com/images/nav-solutions-up.gif');
preload('solutions_over','http://www.confitech.com/images/nav-solutions-over.gif');
preload('gallery_up','http://www.confitech.com/images/nav-gallery-up.gif');
preload('gallery_over','http://www.confitech.com/images/nav-gallery-over.gif');
preload('support_up','http://www.confitech.com/images/nav-support-up.gif');
preload('support_over','http://www.confitech.com/images/nav-support-over.gif');
preload('media_up','http://www.confitech.com/images/nav-media-up.gif');
preload('media_over','http://www.confitech.com/images/nav-media-over.gif');
preload('about_up','http://www.confitech.com/images/nav-about-up.gif');
preload('about_over','http://www.confitech.com/images/nav-about-over.gif');


function changeImage(layer,imgName,imgObj){
    if(document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
    else document.images[imgName].src = eval(imgObj+".src");
}