function openWindow(theURL,winName,features) {
    window.open(theURL,winName,features);
  }
  
  function changeImage(witchone,newimage) {
    document[witchone].src=newimage;
  }
  
  function preloadImages(pathAndBegenning,preloadedImages,endding) {
    var preloaded_Images=preloadedImages.split(' ');
    var images=new Array();
    for (var i=0; i<preloaded_Images.length; i++){
      images[i]=new Image();
      images[i].src=pathAndBegenning+preloaded_Images[i]+endding;
    }
  }
  
  preloadImages('images/','mfr m1 m2 m3 m4 m5 m6 m7 m8','_ov.gif');