Image11 = new Image();
Image11.src="/img/but_blog_on.gif";
Image21 = new Image();
Image21.src="/img/but_youtube_on.gif"; 
Image31 = new Image();
Image31.src="/img/but_forum_on.gif";
Image41 = new Image();
Image41.src="/img/but_twitter_on.gif"; 

function CaricaFoto(img){
  foto1= new Image();
  foto1.src=(img);
  Controlla(img);
}
function Controlla(img){
  if((foto1.width!=0)&&(foto1.height!=0)){
    viewFoto(img);
  }
  else{
    funzione="Controlla('"+img+"')";
    intervallo=setTimeout(funzione, 0);
  }
}
function viewFoto(img){
  largh=foto1.width+20;
  altez=foto1.height+20;
  stringa="width="+largh+",height="+altez;
  finestra=window.open(img,"",stringa);
}