function submitonce(theform){
if (document.all||document.getElementById){
for (c=0;c<theform.length;c++){
var tempobj=theform.elements[c]
if(tempobj.type.toLowerCase()=="submit"||tempobj.type.toLowerCase()=="reset")
tempobj.disabled=true
}
}
}

function PrevFoto(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,20);
}
}

function viewFoto(img){
largh=foto1.width+20;
altez=foto1.height+25;
LeftPosition = (screen.width) ? (screen.width-largh)/2 : 0; 
TopPosition = (screen.height) ? (screen.height-altez)/2 : 0; 
stringa="width="+largh+",height="+altez+",top="+TopPosition+",left="+LeftPosition;
finestra=window.open(img,"",stringa);
}