function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}



<!-- Begin 
function BerksPopUp(){ 
var img = document.images["product_large_image"].src;

	if(img != "" && img.indexOf('images/spacer.gif') == -1){
		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+20; 
stringa="width="+largh+",height="+altez; 
finestra=window.open(img,"",stringa); 
} 
//-->