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];}
}

rnd.today  = new Date();
rnd.seed   = rnd.today.getTime();

//adding more images? increase the array size
var images = new Array(6); 
	
////////////////////////////////////////////////////	
function rnd() 
{
        rnd.seed = (rnd.seed*9301+49297) % 233280;
        return rnd.seed/(233280.0);
}
///////////////////////////////////////////////////
function rand(number) 
{
        return Math.ceil(rnd()*number);
}
////////////////////////////////////////////////////
function rand_image()
{
	
	// SET YOUR IMAGE NAMES HERE
 	images[0]="disegno.jpg"; 
	images[1]="leonardo.jpg"; 
	images[2]="il_codice.jpg"; 
	images[3]="vingi.jpg";  
	images[4]="f19tronc.jpg"; 
	images[5]="I.jpg"; 
	
	var random_number = rand(6);
	random_number--;
	return images[random_number];
	
}
	
/////////////////////////////////////////////////////	
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images ) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

window.onerror = errorhandler;
function errorhandler( msg, url, ln)
{
  alert("Error: "+msg+"\nIn File: "+url+"n\At Line:"+ln);
  return true;
}