function show_div(x)
{
//opera Netscape 6 Netscape 4x Mozilla 
if (window.innerWidth){ 
	a = window.innerWidth; 
	} 
//IE Mozilla 
if (document.body.clientWidth ){ 
	a = document.body.clientWidth; 
	}

b = 900;
c = 659;

if(a>b)
  d1 = (a-b)/2;
else
  d1 = 0;
d2 = b-c;

d = d1 + d2;

 
if(x==1) { // cattedrale
	document.getElementById("pop1").style.visibility = 'visible'; 
	document.getElementById("pop1").style.left = d + 303 + 'px';
	}
else if(x==2) { // S. Andrea
	document.getElementById("pop2").style.visibility = "visible"; 
	document.getElementById("pop2").style.left = d + 185 + "px";   
	}
else if(x==3) {  // S. Girolamo
	document.getElementById("pop3").style.visibility = "visible"; 
	document.getElementById("pop3").style.left = d + 395 + "px";   
	}
else if(x==4) {  // S. Croce
	document.getElementById("pop4").style.visibility = "visible"; 
	document.getElementById("pop4").style.left = d + 325 + "px";   
	}
else if(x==5) {  // museo diocesano
	document.getElementById("pop5").style.visibility = "visible"; 
	document.getElementById("pop5").style.left = d + 405 + "px";   
	}
}

function hide_div(x)
{
if(x==1)
	document.getElementById("pop1").style.visibility = "hidden"; 
else if(x==2)
	document.getElementById("pop2").style.visibility = "hidden";
else if(x==3)
	document.getElementById("pop3").style.visibility = "hidden";
else if(x==4)
	document.getElementById("pop4").style.visibility = "hidden";
else if(x==5)
	document.getElementById("pop5").style.visibility = "hidden";
}