Puoi fare cosi

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
var myPopUp;
var curImage;
var prevImage = null;
function view(anImage) {
  if (prevImage != null) {
	 myPopUp.close();
	} // if (prevImage != null)
  curImage  = anImage;
	prevImage = curImage; 
  myPopUp = window.open("test2191b.html","____","width=200,height=200,left=100,menubar=no");
} // function view(anImage)

function closePopUp() {
 myPopUp;close();
} 
//-->
</script>

</head>
<body>
[img]rossa.jpg[/img]
[img]verde.jpg[/img]
[img]blu.jpg[/img]

</body>
</html>
File : test2191b.html
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function visualizza() {
 document.getElementById('immagine').src = window.opener.curImage.src;
}
//-->
</script>

</head>
<body onload="visualizza()">
[img][/img]
</body>
</html>