function simplePreload(){ 
  var args = simplePreload.arguments;
  document.imageArray = new Array(args.length);
  for(var i=0; i<args.length; i++){
    document.imageArray[i] = new Image;
    document.imageArray[i].src = args[i];
  }
}
simplePreload( 'buttons/home2.jpg','buttons/type2.jpg','buttons/period2.jpg','buttons/process2.jpg','buttons/portfolio2.jpg','buttons/contact2.jpg','buttons/button2.jpg' );